Added update to global token in get_flight_offers

app.py

@@ -93,6 +93,8 @@ def get_flight_offers(departure_year: int, departure_month: int, departure_day:
     Returns:
         dict: A JSON dictionary containing the flight offers and information about them.
     """
+    global GLOBAL_TOKEN
+    GLOBAL_TOKEN = get_access_token()
     
     if not GLOBAL_TOKEN:
         print("Cannot get flight offers without a valid access token.")