diff --git a/agent/application/pages/conversation.py b/agent/application/pages/conversation.py
index 554a0fb..236cd77 100644
--- a/agent/application/pages/conversation.py
+++ b/agent/application/pages/conversation.py
@@ -431,12 +431,10 @@ def tool_call(item: MessageHistoryItem) -> rx.Component:
                 "square-function",
                 width="14px",
                 height="14px",
-                color="var(--prismui-color-3)",
             ),
             rx.text(
                 item.title,
                 font_size="var(--prismui-font-size-1)",
-                color="var(--prismui-color-3)",
                 class_name=rx.cond(item.is_running, "is_running", None),
             ),
             align_items="center",
@@ -451,13 +449,12 @@ def tool_call(item: MessageHistoryItem) -> rx.Component:
             margin="4px 0",
             line_height="1.6",
             font_size="var(--prismui-font-size-1)",
-            color="var(--prismui-color-3)",
         ),
         # 审批
         rx.cond(
             item.has_approval,
             rx.hstack(
-                rx.input(
+                rx.text_area(
                     placeholder="请输入",
                     # 值绑定审批用户提示词
                     value=item.approval_user_prompt,
@@ -495,6 +492,7 @@ def tool_call(item: MessageHistoryItem) -> rx.Component:
             ),
             rx.fragment(),
         ),
+        width="100%",
     )
 
 
diff --git a/agent/application/states/conversation.py b/agent/application/states/conversation.py
index aee44fa..75cd840 100644
--- a/agent/application/states/conversation.py
+++ b/agent/application/states/conversation.py
@@ -187,18 +187,12 @@ class ConversationState(rx.State):
         if not conversation:
             return []
         message_history: list[MessageHistoryItem] = []
-        has_approval = False
-        approval_user_prompt = ""
         for message in conversation.messages.values():
-            approval = message.approval
-            if isinstance(approval, Approval):
-                has_approval = True
-                approval_user_prompt = approval.user_prompt
             message_history.append(
                 MessageHistoryItem(
                     **message.model_dump(),
-                    has_approval=has_approval,
-                    approval_user_prompt=approval_user_prompt,
+                    has_approval=isinstance(approval := message.approval, Approval),
+                    approval_user_prompt=getattr(approval, "user_prompt", ""),
                 )
             )
         return message_history
@@ -464,9 +458,9 @@ class ConversationState(rx.State):
                             ]
                             message.is_running = False
                             message.title = f"{tool_name}已完成"
-                            message.content = cast(
-                                str, content
-                            )  # 约定工具返回分片内容必为字符串
+                            # 若内容非空字符串则更新
+                            if content := message.content:
+                                message.content = content
                             yield  # 通知前端更新渲染
                             messages.append(message)
 
diff --git a/agent/application/workshop/book_flight.py b/agent/application/workshop/book_flight.py
index db92140..d7280ae 100644
--- a/agent/application/workshop/book_flight.py
+++ b/agent/application/workshop/book_flight.py
@@ -220,7 +220,7 @@ async def book_flight(ctx: RunContext[Deps]) -> Flight | NoResult:
         raise ModelRetry("必须先使用 search_flights 查询航班")
 
     if not ctx.tool_call_approved:
-        raise ApprovalRequired(metadata={"content": "您要预定哪班航班？"})
+        raise ApprovalRequired(metadata={"content": "请输入航班号：\n\n"})
 
     # 提取到的航班号
     extracted_flight_number = (
@@ -235,7 +235,11 @@ async def book_flight(ctx: RunContext[Deps]) -> Flight | NoResult:
         return NoResult()
 
     if extracted_flight_number not in flight_numbers:
-        raise ModelRetry(f"提取到的航班号 {extracted_flight_number} 不在查询到的航班中")
+        raise ApprovalRequired(
+            metadata={
+                "content": f"提取到的航班号 {extracted_flight_number} 不在查询到的航班中。请确认后重新输入。"
+            }
+        )
     # 预定到的航班
     ctx.deps.booked_flight = next(
         flight
@@ -329,7 +333,14 @@ async def run_stream_events(
                                         event.part.content += f"{searched_flight.number} {searched_flight.airfare}$ 于 {searched_flight.date.strftime('%Y-%m-%d')} 从 {searched_flight.origin_airport_code} 到 {searched_flight.destination_airport_code}\n\n"
                                     yield event
 
-                                # 预定航班无需业务定义
+                                case "预定航班":
+                                    if isinstance(deps.booked_flight, Flight):
+                                        event.part.content = ""
+                                    else:
+                                        event.part.content = (
+                                            "未提取到航班号，请检查后重试\n\n"
+                                        )
+                                    yield event
 
                 case AgentRunResultEvent(result=result):
                     match result:
@@ -337,11 +348,10 @@ async def run_stream_events(
                             match output:
                                 case Flight():
                                     yield AgentPromptEvent(
-                                        content=f"已预定航班：\n\n{output.number} {output.airfare}$ 于 {output.date.strftime('%Y-%m-%d')} 从 {output.origin_airport_code} 到 {output.destination_airport_code}\n\n"
+                                        content=f"已成功预定：\n\n{output.number} {output.airfare}$ 于 {output.date.strftime('%Y-%m-%d')} 从 {output.origin_airport_code} 到 {output.destination_airport_code}\n\n本次会话结束。"
                                     )
                                 case NoResult():
                                     yield AgentPromptEvent(
-                                        content="未提取到航班号，请检查后重试"
+                                        content="预定失败\n\n本次会话结束。"
                                     )
-                                case DeferredToolRequests():
-                                    yield event
+                            yield event
diff --git a/agent/database.db b/agent/database.db
index 53f8c06..a2ea2dd 100644
Binary files a/agent/database.db and b/agent/database.db differ