A：Thank you very much for everything you have done for me during my stay in China.
十分感谢我在中国期间您为我做的一切。
B：And I must thank you again for your generous help.
我必须再次感谢您的慷慨相助。
A：The help is mutual. I must thank you to see me off. My wife and I will be looking forward to seeing you. You will come to see us, won't you?
帮助是相互的。谢谢你为我送行。我和我的妻子盼望着和您见面。你会来看我们，是吗?
B：I promise I will take the first chance to call on you. Please send your wife with my best regards.
我答应一有机会马上去拜访您。请代我向您的妻子问好。