plz give me a dialogue between a boy and a vegetable vendor

its just imagination. imagine that you are in a market buying , say an onion. NOW you find that it was quite expensive as compared to other shops. YOU  ASK WAS IT SO EXPENSIVE THEN HE GIVES VARIOUS EXPLANATIONS ........ BUY ONIONS ............YOU RETURN HOME.......
THERE CAN BE DIFFERENT CASES JUST IMAGINE THAT YOU ARE IN HIS PLACE. YOU WILL GET THE DIALOGUES.
IF THIS DOE NOT WORK THEN GO THE MARKET AND BUY VEGETABLES.YOU WILL GET THE CONVERSATION