What do i write in a Work Experience letter to a Hairdressers?

i know the hair stylist really well and she has booked me in but she say she needs it in writing as well and im a bit confused on what to write any tips are welcome :)What do i write in a Work Experience letter to a Hairdressers?
Just write why you want to go there, how old you are and when your next birthday is and how old you will be then. Also include a few of your hobbies. Although you know the stylist, you should always write as if you don't know who's recieving the letter :)What do i write in a Work Experience letter to a Hairdressers?
Hmm, just put that you need to do work experience (for school I presume) and waffle a bit about how you want to work in the hair industry when you're older and could really learn from helping out in the salon? Something like that anyway :)