How did the Youth Travel Service book three people?

If you want to reserve a room for three in a youth hostel, you can follow the following steps:

1. Call the hotel.

2. Explain to the hotel staff the number of rooms you want to reserve (three people).

3. Ask about the room type and price of the hotel and choose the room that suits you.

4. Confirm the reservation information, including room type, price, check-in time and check-out time.

5. Pay the reservation fee and provide your name and contact information.

Please note that you may need to provide some identification documents or other information to ensure that the room you booked meets the regulations of the youth hostel. In addition, I suggest you contact the Youth Travel Service in advance to ensure that there are enough rooms.