Pls.help me to make a Letter for my coming end of contract.

Dear Boss,

I need your help bout my coming end of service in our company I was in Material Dept. Before i was transfer in Safety Dept.

However, bout my salary im worry if It will be decrease cause my Position was changed.

Im currently working in Safety Dept. Since i was transfered here i have a dout that my salary will be affected. My service of my position now and salary i worry if it would be change.

Pls..help me to write the precise letter according to my situation.