Update travel.py

travel.py

@@ -39,7 +39,7 @@ import json
 import logging
 from datetime import datetime, timedelta
 from langchain_google_genai import ChatGoogleGenerativeAI
-from langchain.schema.messages import HumanMessage, SystemMessage
+from langchain_core.messages import HumanMessage, SystemMessage
 
 # Setup logging configuration
 logging.basicConfig(level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s")