Good bye! (Byebye! Bye!)
See you (tomorrow)! See you later!
So long! Farewell!
I'd like to say goodbye to everyone.
I'm afraid I must be going now.
I'm calling to say goodbye.
I'll look forward to seeing you soon.
Let's hope we'll meet again.
Hope to see you again.
Drop in anytime you like.
Mind how you go, bye!
Take care of yourself, and don't forget to keep in touch.
Do keep in touch!
My regards to your family.
A pleasant journey to you!
I'll miss you!
M: I'm afraid I've got to go now。
W: Can't you stay just another minute?
M: Oh, dear, I really have to...
W: Ok, take care of yourself, and I will miss you. Bye!