A：Thank you very much for everything you have done for me during my stay in China.
十分感謝我在中國期間您為我做的一切。
B：And I must thank you again for your generous help.
我必須再次感謝您的慷慨相助。
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?
幫助是相互的。謝謝你為我送行。我和我的妻子盼望著和您見面。你會來看我們，是嗎?
B：I promise I will take the first chance to call on you. Please send your wife with my best regards.
我答應一有機會馬上去拜訪您。請代我向您的妻子問好。