Dear Mrs. Collins
I want to thank you for setting up the interview with Mr. Smith at the Historical Society for me last Tuesday. I would like to let you know that I was hired for the job and was asked to begin next week starting Monday.
I am very excited about this opportunity as this position is in a field I love and will enjoy being a part of. I am honored you chose to lend a hand and I greatly appreciate your help and time in my job search.Sincerely