Take a moment to send a THANK YOU, or a simple note of gratitude to our team and healthcare workers across the state, the nation and THE WORLD. Learn how to write an employee appreciation letter with these templates and examples.Download the template for free (PDF or Word). Guidelines for writing appreciation letters: State what you appreciate and briefly explain why. Casual appreciation letter template. I'd like to thank you for talking with me about the research- assistant position in your seismology lab. Thanking your volunteers is essential to building lasting relationships with them. Here are some tips for how to write a good volunteer thank you letter.