Dear
Our customer has informed us that she can wait no longer for the merchandise we ordered from you on [date] .
We are therefore cancelling our purchase order ，which was contingent on delivery prior to [date] .
Under the circumstances，we are certain that you will understand the necessity of our cancelling this order.
Our customer has informed us that she can wait no longer for the merchandise we ordered from you on [date] .
We are therefore cancelling our purchase order ，which was contingent on delivery prior to [date] .
Under the circumstances，we are certain that you will understand the necessity of our cancelling this order.