How To Write A Customer A Thank You Note . Thank you for your loyalty and for the feedback that you offered when we were testing our premium plans. Consider using dear, whether or not you know the person. FREE 11+ Sample Customer ThankYou Letter Templates in PDF MS Word from www.sampletemplates.com Should you have any questions, we are always here for you. We are honored to have clients like you. Give it a shot and see how your patrons respond, because this is one of the best ‘thank you for your purchase’ examples, and will typically garner a positive reaction.