Sample fee waiver request

Use this as a starting point.

Subject: Fee waiver request, [student name], [grade]
Dear [School office],
I am requesting a waiver of [fee] for my child, [student name], in
[grade]. Our family [qualifies for free meals / is facing financial
hardship].
Please let me know if you need any forms or documents.
Thank you,
[Your name]
[Phone number]