I haven't seen you for a long time. 我好久没见你了。也可以说： 

It's been so long! = It's been a long time.= I haven't seen you in ages.

Dialogue 对话:

M: Hey, Lily! 嘿，Lily！

W: Hi, Damian, wow, I haven't see you in ages! How have you been? 嗨，Damian，哇，好久不见了，你最近怎么样？

M: I've been good, thanks. Wow, you're looking great! 我很好，谢谢，哇，你看起来很不错！

W: I've been working out. Thanks. 我一直在健身。谢谢。

M: Oh cool. Do you have time for some coffee? 哦，好棒。你有时间喝杯咖啡吗？

W: That sounds great. Let's go! 听起来不错哦。走吧！

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