Dear John, 

I want to express my sincere appreciation for your hard work and dedication over the past five years. During your time here you’ve made numerous contributions that have helped make our company successful. Your reliability, commitment, and loyalty are truly appreciated. 

I wish you all the best in your new endeavors. 

Sincerely, 

[Your Name]
Nome del dipendente: John Smith Durata del servizio: 5 anni
Componi una lettera di ringraziamento per il servizio di un dipendente.