Thank you so much for continually trusting us with your family's footwear needs. We appreciate you for all the time you have bought from us!To express our gratitude, we are sending some free samples for you to use. Subject: Thank You for Referring New Customers! Start with "thank you". Express how you hope to contribute to your field of study. Use a formal closing, such as "Warm regards," "With appreciation," or "Sincerely. Learn how to write an employee appreciation letter with these templates and examples. Download the template for free (PDF or Word). Sending out customer appreciation letters is an excellent way to connect with your clients.