My writing exam

CORRECTION

Your Performance Report

Dear Daniel

I am writing to let you know I am really satisfied with your development area in the last year. 
At the same time, I want to do some observations about your performance with your colleagues. You are a leader. However, you could enhance the union in your department because they not know them each other. 
Finally, remember if you do that, probably I could talk about of a pay raise. 
For further details, you can come to my office next week. 
Yours faithfully. 

Yuval