Réponse
Dear Hedy lammar,
Hello, it's Marion(par example) I just wanted to tell you that I really appreciate your career and your achievements. It's just wonderful. I really liked how you worked so hard even if it wasn't your work time and always helping others very well. Thank you for all your help to our project. Working with you is always wonderful and appreciable. You did great job in every situation you really should go on more and more to progress a lot and to get better salary.
Sincerely your boss
ps: Do you want to have dinner together sometimes?