Update session.py

session.py

@@ -8,6 +8,7 @@ class Session:
         self.auth_tokens = {}
         self.last_intent = None
         self.awaiting_variable = None
+        self.chat_history = []
 
 class SessionStore:
     def __init__(self):
@@ -24,3 +25,4 @@ class SessionStore:
     def remove_session(self, session_id):
         if session_id in self.sessions:
             del self.sessions[session_id]
+