A：Now,you are to board the plane.We're sorry that we haven't done much to help you when you stayed in China.
现在你要登机了。很抱歉，你在中国的时候我们对你的帮助很不够。
B：I appreciate what you have done for me.Everything I have seen here has left a deep impression on me. I really don't know how to express my thanks to you.
十分感谢你对我的关照。在中国见到的一切给我留下了深刻的印象。我真不知道怎样感谢你们。
A：We are ready to help you.
我们很乐意给你提供帮助。
B：Will you be kind to say "Thank you" to Mr.Zhang and other friends for me?
请代我向张先生和其他的朋友们转达我的谢意好吗?
A：I'd like to.I'm sure your visit will help to promote the friendship and understanding between both of us.Welcome to China again.
我一定转达。我坚信你的来访将促进我们双方的友谊和了解，欢迎你再访中国。
B：Of course,I will.Well,it's time for me to say goodbye.The plane will take off soon.Hope some day you will come to America for a visit.
当然，我会的。好吧，是告别的时候了，飞机就要起飞了，希望你将来有机会来美国。
A：Thank you.I will if I have chance.Goodbye and happy landing!
谢谢诶。如果有机会，我会去的。再见，一路平安!
B：Goodbye!
再见!