Letter 1
Dear Mr.Li, 　　I am sorry I missed our appointment yesterday.I had been looking forward to our mecting today, but when I rechecked my calendar(日程表)I discovered that the meeting was,in fact, scheduled for yesterday.
　　I realize how busy you are and that your time is valuable,but I hope this oversight(疏忽)will not prevent us from rescheduling our appointment. Meeting with you means a great deal to me, and I assure you,this will not happen again.
　　Best regards,
　　John Smith 　　Letter 2 Dear Jane,
　　I apologize for coming late to the division meeting this morning. One of my staff came to my office with a serious personal problem and I had to make a choice.I stayed to talk with him.I realize that I missed an opportunity to give my report.I hope I can still give it at our next meeting.Plcase accept my heartfelt apology. 　　Best regards,
　　Wang Xing