Sure! Here’s the completed request letter using the phrases provided:

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Andy Tran
12 Oak Street
Ryde NSW 2112

Brian Richardson
607 Dennis Ave

Dear Mr. Richardson,

My name is Andy Tran, and I am in Class 7F. Our school's cafeteria serves food such as fast food and sodas. As a principal, you should decide what food the cafeteria will serve and add healthier options to the menu. I am writing to ask for healthy food in the cafeteria. Please listen to us and provide us with healthier food.

I look forward to hearing from you.

Sincerely,
Andy Tran

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Feel free to modify any part of it!