“Hi! I’m the Doctor. I noticed you were having a bit of a bad day. So! Convinced you’re not important, eh? I’ve never heard a stupider stupid thought in my life. Wait. No. That sounds bad. Misguided, is that a nicer word? I don’t mean that YOU’RE stupid, but just your thoughts are stupid—
Right, anyway. Popped by in the TARDIS to remind you that I have never met someone who isn’t important. And if you’re clever and want to tell me we’ve never met, I’d like to remind you I said, ‘Hi! I’m the Doctor,’ and that counts as an introduction.