[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]:
Thank you very much for inviting our staff members to the dinner party you hosted on Thursday. The food and service that evening were stellar, as was the conversation with your team.
We would enjoy getting together with you again within the next few months and will be in touch to make plans. Thank you again for a wonderful evening.
[Sender's first and last names]