A text or ssml response that is preferentially used for TTS
output audio synthesis, as described in the comment on the
ResponseMessage message.
Attributes:
text (str):
The raw text to be synthesized.
ssml (str):
The SSML text to be synthesized. For more information, see
SSML </speech/text-to-speech/docs/ssml>__.
allow_playback_interruption (bool):
Output only. Whether the playback of this
message can be interrupted by the end user's
speech and the client can then starts the next
Dialogflow request.