Is there a reason why a girl would wave and smile to a guy she doesn't know?

ando90
It felt like a special connection when she waved and smiled at me. She does see me regularly. But she doesn't know me. But when we say hello she giggles and even giggles when I asked how her day is going. I have her my loyalty card to punch a hole in it and she giggled. I have a feeling something might be there as the rest of the waitresses aren't like that with me.
Is there a reason why a girl would wave and smile to a guy she doesn't know?
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