星级典句:
第一句: It's nice, but I was thinking of something else.
这件不错，但我想买些别的。
A: How about this one?
这件怎么样？
B: It's nice, but I was thinking of something else.
这件不错，但我想买些别的。

第二句:Thanks. But that's not quite what I had in mind.

谢谢。不过那个和我想要的不太一样。

A: Have you seen this one? This style is popular right now.
您看过这件吗？这种款式现在很流行。
B: Thanks. But that's not quite what I had in mind.

谢谢。不过那个和我想要的不太一样。

其他表达法:
当你不喜欢电源推荐的某件商品时可以婉转拒绝：

They are fine, but I don't really like the style.它们不错，但我不太喜欢这样的风格。

Yes, but I think I'll look around some more. 很好，但我想再看看。

Thank you but I'm just looking. 谢谢，可我只是看看。