You have to book a ticket for a specified date, and the ticket will be valid for that particular day from 9:30 am to 9:00 pm. However, if there are any changes in plans, you need to cancel the ticket at least 24 hours in advance to receive a full refund. However, if your plan changes a few hours before your designated ride time, you will not receive a refund for the ticket cancellation. Therefore, you should try booking a ticket for a day when you are sure you will be taking the ride. You either book the tickets online or get them offline from level A.