* Tickets to a dolphin show at a marine park? You would need to purchase these directly from the marine park itself.
* Tickets to a dolphin watching tour? You would need to book these through a tour operator or travel agency.
* Tickets to a sporting event featuring a team named the Dolphins? This would depend on the specific team (e.g., Miami Dolphins) and the event.
Once you clarify what type of tickets you are looking for, I can give you more specific information.