code: def assistant_fallback_actions(self):
          
          if self._assistant_fallback_actions is None:
              self._assistant_fallback_actions = AssistantFallbackActionsList(
                  self._version,
                  assistant_sid=self._solution['sid'],
              )
          return self._assistant_fallback_actions
docs: Access the assistant_fallback_actions
  
          :returns: twilio.rest.preview.understand.assistant.assistant_fallback_actions.AssistantFallbackActionsList
          :rtype: twilio.rest.preview.understand.assistant.assistant_fallback_actions.AssistantFallbackActionsList