You can change the voices on all VOPs so if an American accent grates on your ears watermeadow change to a British one. You can also choose male or female.
And you can stop any of them saying 'you're welcome' or indeed responding to you at all within the 8 second gap after a command. Which is probably why Charleygirl5 has never heard it, hers is turned off.
What made me laugh, when I had a friend's Google Assistant, is that it would answer commands or requests on my audio books.
In the course of the story, the narrator would say, "Can you get me a cup of tea?" and GA would pipe up with , 'I'm sorry, I can't do that yet.'
Yet? I live in hopes!