1234 Archer Road
Gainesville, Fl 32607
[Subject: Normally bold, summarizes the intention of the letter] -Optional-
Dear Justin Holloway,
Thank you for keeping me updated about your conclusion about going in for (Name of Service/ Product) to meet your requirements. I am glad that my knowledge and my recommendations has proved effective in helping you arrive at the right decisions. I am sure that the decision you have made in this regard will give you optimum benefits.
If there is any necessity of further help in this regard, please do approach me without any kind of uncertainties. I would definitely be honored to help you and be able to add to the needs of your company in any possible way.