Dear Sir,
May I writing you these few lines and trust you will understand my intentions.
The fact is that I have now been in your office for three months, and I believe that my experience work has been of real value to you as well as everyone.
When I joined your firm, I was told that my salary should increase after pass probation this show my capability. Now I am getting only 20,000 baht.
I should therefore be much obliged if you would be so kind to me enough as to give me a rise in my salary which would be my motivation and drive.
I hope that my salary not be disparate too much as everyone given.
I am sure you will guess what I mean and respond equal as well as everyone
Very truly yours,