How do i get it so only google answers to my voice only

[AC Question]

For the google assistance I can say ok google show me my appointments for the day but then my boyfriend can do it too from phone and I want it to only respond to my voice

 

[B. Diddy]

Welcome to Android Central! Try the voice retrain option, although I'm not sure if this will stop it from recognizing when other people say "Ok Google." Open the Google app, tap Menu>Settings>Voice>"Ok Google" Detection>Retrain Voice Model.

 

[Chris5483]

Why not just use a lock screen?