Yeah, ok, I could assume that from the gp's post, but what about answering my question directly? How do you address him at the airport, if you have no connectio

Yeah, ok, I could assume that from the gp's post, but what about answering my question directly? How do you address him at the airport, if you have no connection whatsoever? IDK why, maybe you wanna ask him some question, or take an autograph, or you see that he just dropped a wallet, whatever. Will it be "Hey, Bill" or "Mr. Gates"?