Dear Mr.Green,
We are in receipt of your letter of May 1 about No.3 product at your price.We regret that we cannot accept your request.However,we would like to offer you substitutes.which price is lower 10% of the cost.Then you can launch the product into the Latin America market.
Details please see the back of the letter .Meanwhile,we enclose here with our catalogues and the price list.
Your early reply will be highly appreciated.
Truly yours
人称根据题目自拟一下吧