How do you know if a talkative girl likes you?

From the past, I had a few same delivery person who delivered my groceries, and she kept talking for 20 - 40 minutes, then she left on good terms. From our conversations, I couldn't tell if she liked me or not, but I wasn't interested or thought of liking her. I'm interested in looking into this behavior and the feedbacks on this. Thank you
How do you know if a talkative girl likes you?
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