"Hi Tom, I just want to say, Thank you so much for everything that you have done for me over the last month."
"I have worked with Libby twice in the past year on recruitment for vacant territories. The first key thing to say is that I have hired 2 candidates Libby has put forward."
"I just wanted to express my thanks to the team at Zenopa for helping me gain an exciting new position with my new employer, you were a huge help."