Pinky Swear

SETTING: Deli Bistro - A guy goes to the register girl to buy a lunch. Guy realizes his money/card is at home just a few blocks away. Guy pinky swears to girl at register that he will return to pick up his meal after he runs home for his money. Register girl agrees to pinky swear.

QUESTION: Is this flirting? If, so to what degree? Does age play a factor in whether or not it is flirting?
Pinky Swear
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