Creating a Dialogflow account is simple and easy. The process involves the following steps:
- Visit https://console.dialogflow.com/api-client/#/login and you will see the following screen:

- After clicking the sign in with Google button, you'll be asked to choose which Google account you want to use with Dialogflow.
- On selecting the account, you might be asked to allow Account Permissions for Diagflow and also to accept the Dialogflow terms and conditions.