Dear customer,
As manager of [COMPANY], I want to take the time to thank you for letting us serve you. We want to make sure your experience with us is absolutely perfect and you can help us achieve this by completing this short questionnaire. Naturally, all your responses will be kept in the strictest confidentiality. As a token of our appreciation, please find attached a coupon for …
Sincerely,
[MANAGER_NAME]
Manager