As long as any changes to your trip are made with enough advance notice, no additional charges or fees will be applied, and you will receive a refund for the change or cancellation. To ensure you receive the full refund amount, be sure to modify your booking within the following timeframes: - Within 30 minutes of creating a trip - Up to 3 hours before the start time (for trips less than 8 hours in length) - At least 24 hours in advance (for trips greater than 8 hours in length) Cancellations or shortened bookings made outside of the above timeframes will be ineligible for a refund.