An existing conversation has closed. This is fired when a telephone call
is terminated, or a conversation is closed via the API.
ConversationStarted
A new conversation has been opened. This is fired when a telephone call
is answered, or a conversation is created via the API.
HumanInterventionNeeded
An existing conversation has received notification from Dialogflow that
human intervention is required.
NewMessage
An existing conversation has received a new message, either from API or
telephony. It is configured in
[ConversationProfile.new_message_event_notification_config][google.cloud.dialogflow.v2.ConversationProfile.new_message_event_notification_config]
UnrecoverableError
Unrecoverable error during a telephone call.
In general non-recoverable errors only occur if something was
misconfigured in the ConversationProfile corresponding to the call. After
a non-recoverable error, Dialogflow may stop responding.
We don't fire this event:
in an API call because we can directly return the error, or,
