Changing names is fine even last minute before the trip. Changing dates, however, is little more complicated. During high season we need at least seven days before the trip to change your dates free of charge. If your departure is in less than seven days, there might be a charge, but this depends on a company. From us it's free.
If you change your mind, you can get your money back free of charge two weeks before departure - 100%. After two weeks you will get 50% back, and two days before departure there is no money back. This also applies when you change your mind. If you are not satisfied with the level of services, you can contact us, and we will consider refunding your ticket (at least a part). For example, if you miss the boat due some error of the transportation company. We always try to resolve any issues to the satisfaction of our customers.