【正确答案】[范文]
Dear Sir or Madam,
   We read the advertisement for your restaurant in the newspaper. Our company is going to hold its annual convention on Dec. 15. We wish to book a banquet for about 40 people in the evening. Will you be so kind to estimate the cost for us? And we will appreciate it if you can send us a menu to decide the dishes in advance.
   I hope you can reply as soon as possible so that I can inform the guests in time.