Date
Dear Ms.Apirada,
I'd like to resign from Baxter Healthcare Thailand effective ....Month...Day, 2016. During my stay in Baxter, I've gain experience through assignment as well as formal training provided by the company. It has been good opportunities working here. Thank you for giving me the support, understanding, and encouragement during my employment.
Please treat this letter as my resignation request for your approval process accordingly.
Sincerely Yours,
Name