The only time you need to use specific voice commands to interact with the digital assistant is when you activate it. After activating the assistant, just speak or give instructions to it using everyday phrases.
Note
Google Assistant isn't available in every language yet. Find out more at support.google.com or try to use another language if you can.
Say "Ok Google" or "Hey Google" to activate Google Assistant.
The assistant confirms that it's listening.
Speak or give instructions to the digital assistant using everyday phrases.
Tip
Other ways to activate
You can also activate the digital assistant by pressing the voice control button on the steering wheel 
and via the centre display.
Sign in to your Google account
If you sign in with a Google account, Google Assistant will be more personalised when the car is online. For example, you can easily call contacts stored in your Google contacts or check what's in your Google Calendar.