Dialogflow is a development suite which is used for building interfaces for websites, mobile applications, some of the popular machine learning platforms, and IoT devices.

It is powered by machine learning to recognize the intent and context of what a user says, allowing your conversational interface to provide highly efficient and accurate responses. Natural language understanding recognizes a user's intent and extracts prebuilt entities such as time, date, and numbers. You can train your agent to identify custom entity types by providing a small dataset of examples.

This service offers cross-platform and multi-language support and can work well with the Google Cloud speech service.

You can read more about Dialogflow Enterprise Edition here: https://cloud.google.com/dialogflow-enterprise/.