你是刘玲(Liu Ling)，写一封给晓东(Xiao Dong)的道歉信，讲明道歉的原因、解决问题的办法，以弥补因晓东来拜访而自己不在家给他带来的沮丧。
Dear Xiao Dong,
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 I was ignorant of your visit. 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'll call you on Friday afternoon at five 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,
Liu Ling
