Thank you very much for the wonderful talk on Friday. I’m writing to extend my sincere gratitude for... I’m writing to express my thanks for... I would like to convey in this letter my heartfelt thanks to you for... I’m very grateful for all that you did for me. It was very kind of you to.... I’d like to show our respect and gratitude to you. We really appreciate all you have done for us. I appreciate it more than I can say. I am most grateful for your selfless devotion. Without your help/ But for your help, I couldn’t have... Another thing that I can’t forget is that you...