Wanna buy a box

Day 1
"Ding dong."
"Yes?"
"Do you want to buy a box?"
"Erm...what is in the box?"
"Nothing inside,is just a empty box."
"No"
Day 2
"Ding dong."
"Do you want to buy a box?"
"I say I don't want to buy your stupid box!"
Last Day
"Ding dong."
"Do you want to buy a box?"
"Fine I will buy your stuid box!"
"Not for sale!"

Lol