[He only hears bits and pieces of what the guy is saying, though partially because right now he's twisting his finger in his ears, as if to clean them of the ringing. Based on what he did hear and sees, he makes a logical assumption:]

No, thanks, I'm not interested in buying your eyebrow style kit! Smart of you to show it off, first, though!

[He pops his finger out of his ear and gives him a thumbs up. Phone sales calls are annoying, but this guy is just doing his job, so might as well give him some encouragement.]