Compliment or praise the work of an employee from another firm - 2

Dear Felix

I am writing to thank you for the training seminar you arranged, and to especially thank you for sending Mr. Johnson to be our primary instructor. He did his homework well, and was more aware of our needs than any of our previous instructors. We appreciate the time he took to study samples of our work in advance so his comments were immediately applicable. We would welcome his instruction again. Please convey our thanks to Mr. Johnson.

Regards
Lydia