[Your letterhead, if desired; if not, your return address]
[Date of letter-month, day, and year]
[Recipient's first and last names]
[Street or P.O. box address]
[City, State ZIP code]
Dear [recipient's name]:
It was a great honor to have you speak at our annual banquet and fundraiser on Friday evening. Thank you for taking the time to do this. I have received many favorable remarks about your speech and the style in which you delivered the information. I hope we can arrange to have you speak at another event in the near future.
Thanks again for providing such a compelling and informative speech. We will talk with you again soon.
[Sender's first and last names]