根据对话内容，在空白处填入恰当的表达。
A: Can I help you?
B: Yes. I want to buy some tickets for the concert next week.
A: 1 tickets do you want?
B: Three.
A: Which performance do you like, Thursday evening 2 Sunday evening?
B: The day is not important, but my friends and I want to sit together.
A: Let me see if I can help you. You know the singer is very popular and 3 sell well.
B: I know.
A: Ah, there 4 to be three such seats for Sunday's concert.
B: That's fine. How much are they?
A: 30 dollars each, 90 dollars in all.
B: Here's 100 dollars.
A: Thank you. 5 , your tickets and the change.
