Can I use famous brand names in my story? Or should I modify them to something I like? 
probably not
So modifying them would be the best idea?
You can use them. You can mention them in passing, but not repeatedly. And the plot can’t revolve around them.
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its fine if its like. a single comment like. yeah my shoes are addidas. It cant be an entire story revoling around a girl who wanna be a fashion disigner for gucci
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I just want to use them in usual conversation. Actually in a rich people’s conversation. 
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As Lilly mentioned, a brief mention of them is fine. 
Random rich person: “Yeah, I only wear Gucci, I just bought a third summer house, have you heard about Brittany and her gardener…? Blablabla”
You can also modify words:
Eg: frappuccino to epiccino
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Yeah, but I’m not sure to what extent that absolves the writer of any trademark infringement. I know my story mentioned “Jeopar—uh… a trivia game” in reference to a minigame I made, and I had to change it. 
Every writer that I’ve seen use a switched-up name to clearly reference an IRL brand was well within their rights to use the actual brand name, since they weren’t crucial parts of the story.
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