Hitting On Cashiers Is So Not Cute

I am twenty and working at a pet store. We have a sale on bird cages. This weird-looking guy in his forties comes up to my counter with a cage.

Customer: “I’m buying this for my cockatiel.”

I try to make polite conversation.

Me: “Aw, cockatiels are so cute!”

I ring up all the guy’s purchases, and the receipt prints. He takes it and inspects it, but then he looks confused.

Me: “Is there something missing from the receipt?”

Customer: “Yeah. Your phone number.”