It was a pleasure meeting with you on [Date], and having the opportunity to discuss your education and your career goals.
We appreciate your frankness and feel that since your objectives are to work in the field of [specify area], you should attempt to find a position with a firm that would enable you to gain the necessary experience in your preferred area. Regretfully, our firm does not afford you this opportunity.
We are certain that you will find a position which suits you qualifications, and I personally believe that you have a great deal to contribute.
Please accept our firms best wishes for your future.