Update app.py

app.py

@@ -173,7 +173,7 @@ async def handle_message(message: cl.Message):
                     "booking_id": booking_id,
                     "question": question
                 },
-                callbacks=[cl.AsyncLangchainCallbackHandler()]
+                callbacks=[cl.AsyncLangchainCallbackHandler()])
 
             #response = await api_chain.acall({"booking_id": booking_id}, callbacks=[cl.AsyncLangchainCallbackHandler()])
         else: