Courrier-type en anglais - Félicitations pour service rendu

Dear [Mr or Mrs or Sirs], I wanted to tell you how pleased I am to have worked with you over the past ten years. You have always handled the situation the best way, especially in [circumstances], and always were a great help to us. Everyone here has appreciated your skill and kindness. We thank you for everything you have done for us and would be pleased to recommend you to eventual employers dealing with [domaine]. We look forward to working with you again in the future. Yours sincerely [votre nom] [votre fonction]