salesman: good morning sir, what can i do for you?
tim: i want to buy a pair of shoes for myself.
salesman: ok.which kind of shoes do you like?gym shoes or leather shoes?
tim: gym shoes,please.
salesman: and which colour do you prefer?
tim: i prefer blue ones.
salesman: what about this? it only costs 150 yuan.
tim: oh, that's cool. i will take it because i don't want to pay more than 200 yuan for my shoes. here is the money.
salesman: here are your shoes. bye.
tim: thank you, byebye.
salesman:you are welcome.