Please reply if interested.

如果有兴趣，请答复。

youdao

Why bother asking if you're not really interested?

如果你不是真的感兴趣，干吗费口舌打听呢？

《牛津词典》

youdao

But if you are more interested in fast cars, here is a new turn in the world of motorsports.

VOA: special.2010.07.30

I think she is a character that you can--if not identify with--at least, you can understand and be interested in.

也至少能够理解和感兴趣的角色，所以，在这本书，还有我们下次。

耶鲁公开课 - 1945年后的美国小说课程节选

It's really nice to meet you. You know, if you think... here, this is what I'm interested in.

见到你真的很高兴。如果你想……在这里，我就是对这个感兴趣。

就业的方法 - SpeakingMax英语口语达人

Their motives are no doubt honest, if interested.

FORBES: E. coli Outbreak Underscores U.S. Food Safety Leadership

If interested in raising growth capital in the private markets, they too would face difficult creditors on the way to subpar growth, which would ultimately make government debt in drachma even less attractive in a vicious cycle.

FORBES: Talk Of the Euro's Coming Demise Is Greatly Exaggerated

If you're interested in how people behave, if you're interested in the way they talk about themselves, the way the conceive of themselves, it's very hard to ignore drugs nowadays, because that is so much part of the conversation.

BBC: News | NEWSNIGHT | Jonathan Franzen interview transcript