Please contact us again if we can help in any way. /please don’t hesitate to contact us again if any problem arises.这个特别对客户的信， 多数都有。
Yours faithfully/regards/best regards
signature
Mr Chen
Director of IT Department
道歉信， P30 Q1
1. 首先明白要写什么内容点， 这题很明确， 可是后面的可能就不太明确， 需要自己总结了。
2． 语气， 因为是对客人， 所以一定是客气加正式。 2-1-3 or 1-2-3
Dear: Mr. Tana
Thank you for contacting us.
I am sorry to learn that your order of two video machines hasn’t reached you yet (首先要用句型表示得知不好消息， 但这不是道歉). After informed by our customer service department, this is due to some unexpected transportation problems, which we are making continuous efforts to avoid in the future.
In addition, the exact delivery date would be reconfirmed by (no later than) the end of next week. You will be informed as soon as it is fixed.
Again, please accept our sincere apologies for any trouble this has incurred. And we promise that there will not be any similar problems in the future.
Should you have any problems regarding this issue, please don’t hesitate to contact us again.
Yours truly,
Mike