我：你吃午饭了吗？

朋友：还没有呢，你呢？

我：我也还没吃。要一起去吃点什么吗？

朋友：好的，那我们找个地方吃饭吧。

How to say '你吃午饭了吗？' in English:

Me: Have you had lunch yet?

Friend: Not yet, have you?

Me: No, I haven't either. Do you want to go grab something to eat together?

Friend: Sure, let's find a place to have lunch.