Dear Jane,

I can't tell you enough how much we appreciate you coming to our office and giving such an excellent presentation. I know for a fact that everyone thoroughly enjoyed being in your class.  You have such a presence and boy does it show when you are sharing with everyone. Jane, thank you very much for taking time from your hectic schedule and helping all of us.  You are the talk of the office and I received several emails and phone calls from guests complimenting you. Again, thank you.