Ideally the responses are curt and short. Such as the star trek computer that just has a beep to acknowledge. I don't really feel it necessary we need to start anthropomorphizing machines.
"hey Google" is spectacularly annoying. I am not talking to Google (large corp), and I don't want to greet the plastic on my desk in order for it to function.
Can only hope in the future we can say "computer", state what we want and then ack with a beep.
Anthropomorphizing is all marketing and tricking people into attachments to devices. A side effect is that a wrong response creates not only annoyance (oops wrong prompt), but now also disappointment (why doesn't Siri listen to me!?).