Ben: I'd like a return ticket to York for Friday, please. What's the cheapest option?
Clerk: The advance return is twenty-four pounds. You must take the ten twenty train and return at six forty.
Ben: The outward journey is fine. The problem is the return. I'm visiting my sister, and her appointment may finish late.
Clerk: Then a flexible return may suit you better. It costs thirty-two pounds, and you can come back on any train after four.
Ben: Can I change the cheaper ticket on Friday if I need to?
Clerk: You can, but there's a ten-pound change fee, plus any difference in the fare. You must change it before the booked train leaves.
Ben: So one change could make it more expensive than the flexible ticket.
Clerk: That's right. If your plans are certain, the advance ticket saves money. If the time is uncertain, flexibility can be worth the extra cost.
Ben: I'll take the flexible return. I'd rather spend a little more now than rush my sister or pay a fee later.
Clerk: Of course. Here's your ticket. Keep it for both journeys, and check the departure board before you travel.