Update main.py

main.py

@@ -61,8 +61,9 @@ async def webhook(
         # 處理無效的簽章錯誤
         raise HTTPException(status_code=400, detail="Invalid signature")
     return "ok"
-
+    
 # 處理文字訊息事件
+chat_sessions = {}
 @line_handler.add(MessageEvent, message=TextMessage)
 def handle_message(event):
     global working_status