docs: def FetchResponses(self, session_id):
      """Retrieves responses for a well known flow.
  
      Args:
        session_id: The session_id to get the requests/responses for.
  
      Yields:
        The retrieved responses.
      """
      timestamp = (0, self.frozen_timestamp or rdfvalue.RDFDatetime.Now())
  
      for response in self.data_store.FetchResponsesForWellKnownFlow(
          session_id, self.response_limit, timestamp=timestamp):
        yield response