Request For Extension Of Payment Due

Dear Sir or Madam:
We have a very uncomfortable request - we are asking for an extension of time
on our bill for ________ (amount). We had been depending on a check from one
of our clients to cover this bill. However, we have just been informed that this
check will not arrive until _______ (date).
Therefore, we must ask for your indulgence and grant us a two weeks' extension
of time on our bill. We are sorry about any inconvenience this may bring to you.