[Dipper finds himself literally swept off his feet by Scott so fast that he can't really find a chance to respond, reaching up to hold his hat on his head with his free hand while his other is being jovially shaken.]

Aha, n-no it's fine! It's good to meet you too!

[He chuckles, glancing up as he tries to remember all of the questions Scott just prattled off to him.]

Let's see... yes this is a new hat, Gravity Falls is great, Mabel has a pet pig now and I'm ok! Though my Great-Uncle didn't waste any time putting me to work..

[Dipper jerks a thumb over his shoulder toward the currently unmanned cash register.]

But uh, come in and look around and stuff! It's been pretty slow around here today so I'm really glad to see you.