Back in September 2016, Google purchased Speaktoit, a company specializing in natural language technology. The company's main service at the time was API.A... by Corbin Davenport in Development, Google, News
http://www.androidpolice.com/2017/10/11/api-ai-googles-tool-making-assistant-apps-now-dialogflow/
* to create Google Assistant Apps * pre-built agents * Dialogflow