I'm a dork. Here's how this conversation went:

Me: So, have you been here before?
Them: Yes, we come every year.
Me: Ah, that's great. I was here last year.
Them: Uh huh.
Me: Stare. Smile.
Them: Stare. Smile.
Both: Uncomfortable silence.
Them: Okay, then, have a great day.
Me: Yeah, um. You too.