When will the show begin?

Mark: Hello, Jenny. What are you doing here?
Jenny: Hello, Mark! This is my daughter, Sarah. It’s the school holidays so we’re shopping now--we’re not sure what to do after that.
Mark: Well, there’s a show for children this afternoon in the library where I work.
Jenny: Oh? What time is it at?
Mark: It starts at two and finishes at three thirty. It’s only a quarter past one now. Do you think Sarah would like that?
Jenny: How much is a ticket?
Mark: Well, it’s one pound fifty for adults and seventy-five pence for children. Programmes are twenty-five pence.
Jenny: And does your library run a reading course in the holidays?
Mark: Yes, and if children under ten, like Sarah, read four books in six weeks, we give them something to take home.
Jenny: What, like a book?
Mark: Well, this year it’s a pen, but sometimes it’s a book or a school bag. Meet me after the show and I’ll give you more detail.
Jenny: Thanks. See you later then.