You can find loads of sample letters on the internet- it's just a matter of choosing one that is the 'best fit' for you.
It's important that you type it, with correct spelling and good language. Keep it short, to the point and business like. Where possible say something very positive about your experience.As you don't specify exactly what you need, I've written a sample letter below. Hope it helps!
Mr John Smith
Head of Sales
Walker Bolts
Newtown
1 July 2014
Dear Mr Smith (or John if you are on first name terms)
No doubt you will be aware that my current contract with Walker Bolts expires at the end of August 2014 and I am writing today to ask you to consider extending my contract beyond this date.
Since joining this company in January I have really enjoyed working for you and for Walker Bolts, and believe I have progressed a great deal in my understanding and awareness with regard to sales and marketing of nuts and bolts. I also feel that I have contributed to the company and have been a productive member of staff and a valued colleague.
I would be grateful if you would consider my request and let me know your answer by the end of this month as I have to give notice to leave or renew my apartment lease by this date.
Yours sincerely
Fred Jones
