Dear Sir.
You may not remember me but I hope that you do.
My name is Rana Braiss i used to work with you in 2006. Im sorry i had to leave so suddenly but unfortunetly my personal circumstances as you were aware were complicated.
The reason for my email is one to thank you for the opportunity of working with you and getting to know you was a pleasure.
Further more my email is ***.au.
If there is anything I can help with, please let me know.
thanks for your time.