What to say when you leave口语练习(4)

A:You will write. Won't you?
   B:Course I will. I'll miss you. I'11 let you know how I get on.
   A:Make sure you do... got everything? Know where your ticket is?

   B:Don't worry! I'm not a child! I must get on the train now.Thanks for all you've done for me.
   A:I did nothing. Have a safe journey! Be careful.
   B:Right! Goodbye!
   A:Goodbye! Good luck!