The message returned from the DetectIntent method.
The selected results of the conversational query or event
processing. See alternative_query_results for additional
potential results.
The audio data bytes encoded as specified in the request.
Note: The output audio is generated based on the values of
default platform text responses found in the
query_result.fulfillment_messages field. If multiple
default text responses exist, they will be concatenated when
generating audio. If no default platform text responses exist,
the generated audio content will be empty.
