Request for a Recommendation Letter and salary negotiation letter

Dear Mr. Walter,

I would like to thank you for offering me the position of Product Specialist Position in Google Inc. I am very excited to work for your company and I hope that I can add more value to your company. (Please paraphrase this)

After having an offer of a starting salary of $50,000 and the benefit package (please continue this and negotiate for $55,000)

Closing paragraph