Dear …
I want to thank you for officiating at the launching of our new __(name of new product)__. I know I also speak for others when I say that you did a commendable job. You have an eloquent way of speaking that holds the interest of your audience. Your enthusiasm is infectious and I beleive the program successfully drove home to each of us, how truly exciting this new product is for our company.
As we departed, I believe all of us left with a sense of pride and highly motivated to promote our new __(name of new product)__. Once again, thank you for your notable contribution in helping to make this new product launch a great success. Your efforts are a credit to our company.
Sincerely,