Whats the best way to randomly talk to a girl whos with a guy, and you dont know if they're dating?

BlueGreen45
I saw a really pretty girl at a bookstore today.
I saw she was taking a insta like picture.. but she seemed to be w her dad or older guy of some kind. I tried to go 'bump into her' but by the time i got the nerve, she was in line to pay.
I didn't want to be intrusive, but man she was pretty.

I was thinking of going all out and just saying "hi, are you an influencer for books?" Or "hello, you're really pretty, can i have your number."

How could I have handled this?
Whats the best way to randomly talk to a girl whos with a guy, and you dont know if they're dating?
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