Dear
This is in reference to interview appointment for the article in your publication. Before that we would like to thank you for your courteous request to interview one of our officers for the article you are writing about our business.
(Name of individual) will be pleased to meet with you at our offices at (address), on (day), (date), at (time) I believe that you will find him to be extremely knowledgeable about our business and the role we play in relationship to our industry.
Thank you for your interest in our firm. Please feel free to contact us for any further doubts or clarifications.