Dear (employee name),
You gave an amazing presentation regarding (product). It was a truly outstanding performance.
Our client (client name) was incredibly impressed. We have no doubts that the reason why our company got this contract was because of your presentation.
To show our gratitude for your professionalism and ability to deliver amazing results, please accept our “thank you” check enclosed with this letter. This is our small way of thanking you for an amazing job.
All the best,