Here is a sample letter showing how to write a confirmation letter for your acceptance of the job offered.

Name
Street Address
City, State, Zip

Ms. Somebody
Schenck Business Solutions
200 East Washington Street

Dear Ms. Stanonik:

Thank you for extending the offer for an interview. I am enthusiastic about the opportunity to meet with you and further discuss the Staff Accountant career opportunity. Given your organization's emphasis on teamwork, quality customer service and well-developed communication skills, my career goals are a match with your organization's needs.

As discussed, I will arrive at your Appleton office by 2:00 p.m. on Monday, October XX for an orientation meeting and discussion of my interview schedule. I will bring my completed application for employment at this time. 

Thank you again for the opportunity to interview with Schenck Business Solutions and for the thoughtful consideration of my qualifications. I look forward to meeting you next week.

Sincerely