Dear Kelvin,

Good morning!

I was told your last day was last week. I hope all is well for you and thank you for your support. You have supported my enquiries from troubleshooting to hardware issue within a short timeframe given to you despite your routine workload. GREAT WORK! I wish your company would recognize your great effort in assisting clients and your rich knowledge applied in this area.

Once again, all the best for your future endeavor!