Approaching the girl in the coffee shop?

Okay, so I go to my local cafe almost every morning for my morning cappuccino and there is a really cute girl that works in there... she serves me quite a lot and always strikes up a conversation. Is she interested or is it just good customer service? eg she does it to everyone? How do I take things a bit further? rather then just coming across as creepy? I don't know :( thanks in advance.
Approaching the girl in the coffee shop?
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