-Ticket saller: Can I help you?
-Costumer: I'd like to book tickets to London.
-Ticket saller: For what date?
-Costumer: Friday, 25th August.
-Ticket saller: How many tickets do you want?
-Costumer: Six, please
-Ticket saller: Do you want single or retrun tickets?
-Costumer: three single tickets please. How much is it?
-Ticket saller: 18 pounds.