Dialogflow is Google's platform for building voice agents for Google Assistant.
When you use our voice agent you have to talk to Google Assistant. This voice input is sent to Google and us where we use it to understand what our voice agent should do for you. This is absolutely necessary for our service to give you an appropriate answer.
We never collect or share personal data with our voice agents.
To improve our services we analyze automatically how often utterances are spoken and other analytics. This is done automatically by Google in the Google Cloud Platform.