notifcation letter to employer..

Hello Guys, I need you help and advice on my letter to my HR.
I am informing them that I am finishing my 2years contract.

Thank you very much for your help guys..

Dear __,

I am writing to formally notify you, that I will finish my position as controller with ABC
My last day of employment will be on 31th August 2012 which is my last day in my contract.

This was a difficuly cession, as working for ABC has been a positive experience and one for which I am thankful, I ave learned a great deal here, and have enjoyed working in our project with the tea.
I appreciate the opportunities I have been given at ABC. I would like also to thank you for the support and the professional opportunities you’re offering to me.
I wish you and the company more success in the future.

your sincerely..