假如你是李华,你和在上海上学的英国朋友TOM 约好下周去北京旅游,但你因故不能去了,说明原因 求英语作文

Tom
Before that,we agree to go to Beijing tourism,do you remember?But a week after,I have things to do,so I can't go.Sorry,we have an appointment,but because of my reason,I can't go door,really sorry.We have an appointment with another time.
Your friends
Li hua