I meant to mention ...
I appreciate the time you recently took to discuss with me, the position of __(name of position)__ that you currently have available at __(name of organization)___. It was a pleasure speaking with you and learning more about your organization.
I meant to mention during the interview, that I know how important __(describe something important to the organization)__ is, and I wanted to make sure you knew that I am extremely well versed in __(type of skill required to do it)__. I share your company philosophy and believe that I would fit in nicely to your environment.
I believe that my background and experience would enable me to make a strong contribution to the efforts of your team. In addition to my technical skills, I will bring enthusiasm and the ability to work well in a team atmosphere.
Thank you for the chance to discuss my qualifications with you. I look forward to an opportunity to visit and speak to you further about the possibility of joining your team.