【正确答案】[范文]
Dear Sir,
   I am a guest of your hotel. During the past several days, the air-condition didn't work very well, the attendant didn't come to clean my room, and everything was in a mass. I called the Reception to change to another room, but was told there was no vacant room. I am really disappointed with your service this time. Your hotel is well known for the excellent services among all the guests and I didn't know why all these have happened to me.
   I am looking forward to your early reply.