Update app.py

app.py

@@ -146,7 +146,7 @@ async def ask_question(query: QueryRequest):
     messages = [HumanMessage(content=query.message)]
     final_res = ""
 
-    for event in abot.graph.stream({'messages': messages}, thread):
+    for event in agent.graph.stream({'messages': messages}, thread):
         for v in event.values():
             if isinstance(v, dict) and 'messages' in v:
                 for msg in v['messages']: