Dear

Thank you for affording me the opportunity to meet with
you and members of your staff.

I know that (ex-salesman) serviced your account
for many years and made many friends at your firm. While
his presence will be missed, I can promise that you will
continue to receive the fine service that has always been
afforded by (firm)

The hospitality you showed me yesterday explains why
(ex-salesman) held your organization is such high regard.