辛苦了！

　　You've had a long day. You've had a long flight.

　　尊敬的朋友们！

　　Distinguished/Honorable/Respected friends

　　阁下(多用于称呼大使)

　　Your Excellency

　　我代表北京市政府欢迎各位朋友访问北京。  
 

　　On behalf of the Beijing Municipal government, I wish to extend our warm welcome to the friends who have come to visit Beijing.

　　对您的大力协助，我谨代表北京市政府表示衷心的感谢。

　　On behalf of the Beijing Municipal government, I wish to express our heartfelt thanks to you for your gracious assistance.

　　在北京过得怎么样？

　　How are you making out in Beijing?

　　我一定向他转达您的问候和邀请。

　　I'll surely remember you and your invitation to him.