Thank you for your kind letter regarding your exceptional treatment by one of our employees.  A copy of your letter has been forwarded to the personnel department and will be included in the employee's file.

　　So seldom is it that a customer takes the time to write a letter of appreciation¹， that I feel moved to reward your initiative.

　　Please accept the enclosed certificate， which， when presented， will entitle the bearer to a ten percent discount on the merchandise being purchased at that time.

　　This is but a small token of our appreciation of customers such as you， upon whose satisfaction we have been allowed to grow and prosper² in this highly competitive marketplace.

　　Again， on behalf of our entire organization， a heart-felt thank you.