Update agent_service: only initiate conversation in white list

agent_service.py

@@ -199,6 +199,10 @@ class AgentService:
             user_id = staff_user['user_id']
             agent = self._get_agent_instance(staff_id, user_id)
             should_initiate = agent.should_initiate_conversation()
+            user_tags = self.user_relation_manager.get_user_tags(user_id)
+            white_list_tags = {}
+            if not set(user_tags).intersection(white_list_tags):
+                should_initiate = False
 
             if should_initiate:
                 logger.warning("user: {}, initiate conversation".format(user_id))