A: This hat is cool! How much is it
B: You are so lucky We are celebrating our fifth anniversary. And buy two, get one free.
A: Oh, really? I'll choose two hats for me and my boyfriend.
B: Please take your time to have a look and pick out something you like.
A: OK. Those two, please. May choose one more for free?
B: Sorry, one of what you chose is on sale, which is not allowed to be involved in other promotions.
A: What a pity!
B: You can choose from the shelf over there.
A: But I really like that one.
B: Well, if you buy two, you can have them cheaper.
A: And I cannot get the free one?
B: Aha, no doubt!
A: Well, I'll get them.
B: Thank you for shopping with us.