The captain will have 48 hours to respond. If they accept your change request, the booking will be automatically updated. If they decline or do not respond, the reservation will remain unchanged.
In the event that the change results in a difference in price, you'll either be refunded the difference in the deposit, or you'll be asked to enter your payment details to pay any additional balance.
Please note that you cannot make changes to the details of your trip if it has already taken place.