Dear …
Thank you taking the time out of your busy day to meet with me on __(date)__. It was a pleasure to meet with you, __(first name)__, and I appreciate the opportunity you gave to me to present __(my/our)__ __(type of products/services/skills)__ to you. I am absolutely delighted to have been awarded this __(type of contract/project)__ and I can tell you that am looking forward to it with great enthusiasm!
Please allow this letter to serve as a reminder to you to set up an appointment for __(date)__, the date on which I will commence this project. Once again, thank you and I look forward to seeing you on __(date)__.
Sincerely,