I'm grateful for the opportunity to work for you and I enjoy doing so. I hope you'll agree that, in the two years I've worked for you, I've become an integral member of your team and accomplished a great deal. For example, in the last six months alone, I've   [List of major accomplishments]

　　However, I'm still working for the initial salary on which we agreed two years ago. As I recall, we also agreed to renegotiate my salary in two years based on my accomplishments, and that time has come. In light of my accomplishments and as per our agreement, I'm respectfully requesting an immediate pay rise of six percent, to be followed in six months by a performance-based pay rise of an additional three percent. I strongly feel that I've earned the immediate pay raise and I'm confident that I will also earn the six-month raise based on my performance. But I'm willing to negotiate, as per our agreement. If you would like to meet to discuss this, please let me know.

　　Thanks again for the opportunity. I look forward to continuing to be a key player on your team in a mutually-rewarding relationship.