What else could have I done?

I was at work today helping someone stock shelves (i work in a supermarket), this one girl asked where i could find muesli bars, i responded immediately as they were right where my and my coworker were and i said something like "yeah there's some here", doesn't sound like much in text but it was very smooth, almost like a smooth flirt but it wasn't flirting.

And she let out a little open smile and went on about her business.

Why did she smile like that? and what else couldve i done? Maybe talk to her more? ask her name/number etc?

What else could have I done?
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