i need help typing a letter

<p>yeah so i got wait listed and from what i have seen, people are saying to type up a letter saying how much you want to go to that school and how great it is to your interview person(also is your interview person like mainly responsible for your application, i just wanted to know) but what exactly do i say? i dont even know if this is a good idea or if i should send it to like the admission director. please help</p>