生活中难免遇到身不由己的时刻——临时出差、突发状况、行程冲突，都可能导致无法按时参加会议。此时，一封得体且真诚的道歉信显得格外重要。它不仅关乎礼貌，更是维系人际信任的关键环节。那么，如何撰写一封有效的致歉信呢？

December 15, 2000

Dear Mary,

I am very sorry that I was out when you came to see me yesterday afternoon. The fact is that I had an engagement with some friends and, ignorant of your visit, accompanied them to the cinema. Not until nine o'clock in the evening did I come back. You must have been disappointed by my absence.

I hope you will not leave the city this week. I will call on you on Friday afternoon at four o'clock. As this is the first time you come to Beijing, I will take you to some places that may interest you. Please wait for me in your hotel at the appointed time.

Yours truly,
Xiao Cheng

Oct. 31, 2000

Dear Mr. Clark,

I would like to express my apologies for not being able to keep our 9 o'clock appointment. I had a small accident on my way to school. I will come over to your apartment the day after tomorrow — Monday, November 2, at 9 a.m. if that is convenient for you. I will check my mailbox tomorrow to see if you have left a note for me. Otherwise, I will see you at nine, Monday morning. With many apologies.

Li Xiaomei (Signed)

Sep. 25, 2001

Dear Sirs:

Thank you for your letter concerning Mr. Pennington's visit to China. Unfortunately our Export Manager, Mr. Li is in the U.S. at present and will not be back until 12th October. Therefore, I am very sorry to inform you that he is unable to meet Mr. Pennington these days. He would, however, be very pleased to see Mr. Pennington if he could be in Beijing after that date. We look forward to hearing from you.

Yours faithfully,
Assistance