Buying tickets at the ticket office!!!

Laura: Hello, Id'like three tickets for the theater, please.

Aina: Certainly. How old are you?

Laura: I'm thirteen and my cousins sixteen and eighteen.

Aina: All right. So, that's 1 adult and 2 children. I'd like 21$ altogether, please.

Laura: OK. That's

Aina: Thanks. Here's you change and your tickets.

Laura:Thanks.