ตามนี้นะ ...
Dear ...,
Thank you very much for offering me the position of Technical Account Manager with ...
I had a difficult decision to make. After much thought and careful deliberation, however, I have decided not to accept your offer.
I was interested in the opportunity and working with your team, I do not feel it is the best fit for me at this time.
Thanks again for taking the time to meet with me and for the generous employment offer. I wish you and your company much continued success. I hope we can keep in touch for the future opportunities.
Best regards,
Thitinun Seniyut