Rearrange the following sentences into a reply letter.
However, we are unable to meet with your deadline of the shipping date.
As you may know, the price of raw materials rises dramatically since earlier this year.
It becomes more and more difficult for us to ensure the supply of these materials.
It would be helpful if you agree to change the shipping date. Looking forward to your reply.
Dear Mr. Locker: In regard to your letter of July 29, 2010, we are very happy to receive your repeated order.