Dear Annie,

Thank you so much for giving us the good news.  It was such a pleasant surprise to see it.  Thank you so very much for all the great work that you did to get it approved.  We are really happy and grateful for your effort and high quality work, to get this done for us.  For sure, we will be recommending you to all our friends!!

…

Thank you so much for all your great work. We really appreciate it.

Sincerely,

Client