I'd love to sit down and catch up.

D: Fancy meeting you here. What brings you to this part of town?
见到你真是惊喜。你怎么回来这附近？
L: Yeah, it’s been a while since I last saw you. I’m here to pick up some groceries.
是啊，好久不见了。我来这里买点杂货。
D: Do you want to grab something to eat together? I’d love to sit down and catch up.
你想一起吃点东西吗？我想坐下来好好叙叙旧。
L: I’d love to but I’m meeting a friend for dinner later. Maybe next time? Here’s my number! Call me?
我很想但是我待会儿要和朋友见面。下次吧？这是我的号码？打给我吧？
D: I certainly will.
我一定会。