[Well, it's not like he's single at the moment. He is kind of seeing Opal. But she seems a nice girl... and more than a little lost. And she's from back home; that's easily enough for Bolin to at least want to get to know her better.]

Well I don't know if I'll get the chance to see you in the city again. It's... kinda big and all. But here... [Bolin takes out a piece of paper and scribbles an address down on it.] If you ever are looking for someone to show you around the city, I'd be happy to do so. And it would be good to hear about things are back in Ba Sing Se. Especially after all the things that have just happened, you know, in the Earth Kingdom.

[Yeah, he has no idea that she's not from around this time.]