a: Excuse me boss, I'd like to buy a red skirt, do you have?b: Yes, please follow me.a: How much is this one?b:20 yuan, it's very cheap.a: Too expensive, can you cut the price?b: Then 15 yuan, this is our cost price.a: Ok, but what can I do if it has quality problem?b: You can take it here, and I will change a new one for you.a: OK, deal.b: (pass the skirt) welcome to my store again next time.a: Good bye.b: Good bye.