Write a letter
expressing your inability to execute an order.
This is to express
our gratitude to you for placing an order of 6th instant. However, we regret to
inform you that we are unable to execute your order since the books in question are out of
stock at present. We expect to receive our consignment by the end of this month.
We shall feel
obliged if you allow us to send the books by the first week of next month. We will
appreciate it very much.