假定你是李华，昨天你有一次不愉快的就餐经历，对餐厅的服务员态度非常不满意，于是你给该餐厅老板写一封投诉信．要点如下：
1．问题：牛肉面（beef noodles）里有苍蝇（fly），服务员态度粗鲁．2．要求：餐厅赔礼道歉．
3．希望能改进服务．
注意：
1．词数：100左右；
2．可适当增加细节，以使行文连贯．
Dear Sir / Madam，

I am Li Hua， a frequent customer in your restaurant． I have been pleased with your excellent service for years， but now I'm writing to express my dissatisfaction with the poor service of your waiters．
Yesterday， I went to your restaurant to have lunch but I had an awful experience． When having beef noodles， I suddenly found there were two flies in them， which disgusted me a lot． So I asked the waiter to change another dish． Against my expectations， he didn't change it but said in a rude manner that he was too busy to solve the problem． Needless to say， the way of treating customers was really bad． It's my sincere hope that you can investigate the matter seriously and make a formal apology to me．
I look forward to your better service next time．

I am Li Hua， a frequent customer in your restaurant． I have been pleased with your excellent service for years， but now I'm writing to express my dissatisfaction with the poor service of your waiters．
Yesterday， I went to your restaurant to have lunch but I had an awful experience． When having beef noodles， I suddenly found there were two flies in them， which disgusted me a lot． So I asked the waiter to change another dish． Against my expectations， he didn't change it but said in a rude manner that he was too busy to solve the problem． Needless to say， the way of treating customers was really bad． It's my sincere hope that you can investigate the matter seriously and make a formal apology to me．
I look forward to your better service next time．

Yours，
Li Hua