Dear Mr. Mulroy:
I acknowledge receipt of your letter and wish to express my sincere appreciation of a job well done.
I am very happy with quality of the work done, as well as dealing with two real gentlemen, i.e. yourself and your installer.
Therefore, we will keep your sign on our lawn until October 1, 2009 unless one of your competitors steals it!
P.S. We happily recommended to our friends and family.