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. In some scenarios,
multiple output audio fields may be present in the response
structure. In these cases, only the top-most-level audio
output has content.
