Tony: Why do people like cheese so much?
Alisa: No two cheeses are the same.
Alisa said____________________________________________________
这是学校给的题目，但是我不知道怎么改。
我是改成Alisa said that no two cheeses are the same.
不知道这样对不对。谢谢

你的是对的，也可以说 Alisa said, "No two cheeses are the same."

原问题给的是 reported speech 中的 direct speech转换成 indirect speech 时态要退一步：Alisa said to Tony that no two cheeses were the same.