Google’s Dialogflow environment is a great place to build natural-language understanding applications that automate both text-based (chatbot) and voice-based interactions. All of the voice-enabled AI environments in wide use today (Google’s Dialogflow, IBM’s Watson Assistant and Amazon’s Lex are the big 3) enable voice communications by going through a 3-step process, where spoken input is first transcribed to text by a speech-to-text engine (STT), then given to a bot for analysis, and finally then sent through a text-to-speech (TTS) engine to produce audio back to the user.