Are you making progress?
Did you sleep soundly last night.
Have you gotten over your cold?
How come you look so tired?
Why are you in such a good mood?
I just stopped by to say hello.
What a pleasant surprise running into you.
I'm glad I ran into you. Where have you been hiding lately?
I've been thinking about you lately. Let's talk over coffee.
You're just the man I want to see.
I haven't seen you for ages/in years/for a long time.
It's nice to see you again. Have you changed jobs?
How was your trip to New York?
What has kept you so busy?
参考资料:★尊重手译,鄙视机译★May my answer could be helpful to you : )