It's been nice talking to you.
Keep in touch
Have fun
Good luck!
It's good to meet you. ( first time )
Do your best
That's terrible
Have a good / nice day.
That's wonderful
Have a nice trip.
Welcome
That's too bad
Congratulations !
It's good to see you. ( after the first time )
welcome back!
I'm happy to hear that.
You can do it!
I'm sorry to hear that
Come in
Wow !
