好久不见了。It's been a long time.

好长时间没见面了。Long time no see.

我有好几年没见到你了。I haven't seen you for years.

很高兴能够再次见到你。It's nice to see you again.

真没想到会在这儿见到你。What a surprise to see you here.

这个世界真是太小了。What a small world.

能再遇见你真是有幸。What luck running into you again.

你一直忙些什么呢？What have you been up to?

近况如何？How have you been doing lately?

马马虎虎。Just so so.

到目前为止还好。So far so good.

还是老样子。Same as usual.

Accidental meeting

Tom: Hello, Ann,is that you?
Ann: Yes,it is. Hi Tom,it's a real surprise to see you here.
Tom: It's been a long time. What's new?
Ann: Nothing much. What about you? Is everything going well?
Tom: Not bad I guess. I just got back from Hawaii.
Ann: How was it?
Tom: I had a good time. You seem to be in a hurry. Don't let me hold you up.
Ann: Sorry,I've got a meeting in half an hour.
Tom: Okay,I'll keep you then.
Ann: Great,it was good to see you,goodbye.
Tom: Yes,stay in touch,bye.
Ann: Give me your email,would you?
Tom: Sure,it's thyb@gmail.com.