Misunderstanding Of A Dollar-Printing Factory

(I am working a morning shift behind my register when a disheveled man walks in and approaches the counter. He mumbles and slurs his words together when he talks, making him very difficult to understand.)

Customer: “I need a—” *incomprehensible*

Me: “Sorry, what was that?”

Customer: “I said I need a dollar!”

Me: *thinking he needs to exchange some bills or coins* “Okay, what do you have on you? And how would you like that?”

Customer: “Nooo, I need a dollar.”

Me: *now thinking he might need cash back* “Okay, you just have you buy something small, like a pack of gum or something. I can’t give out money directly from the register.”

Customer: *growing more frustrated* “NO! You see, I have four dollars. And I need five dollars. So, I need a dollar.”

Me: “Sir, I can’t just give out money from the register.”

Customer: *stares at me with a mixture of anger and confusion*

Me: “I can give you cash back or exchange money, but I can’t just give you a dollar. I’m sorry.”

Customer: “Why not?”

Me: “I can’t give you money out of my register.”

Customer: *stares at me again and finally leaves*

(I’m not sure why that dollar was so important, or why it’s so hard to understand that stores don’t just give money out to people who ask.)