Dolphins really do communicate with each other but they don't have a language like ours. Instead they communicate nonverbally through body postures, jaw claps, bubble blowing, and fin caresses and it seems that their language is dependent on what they're doing.
Swimming with the animals paired with intensive speech or physical therapy helps with autism, cerebral palsy and other debilitating ailments. Moreover the companionship of dolphins relax children and get them emotionaly more available for healing and rehab purposes.
Dolphins have also been trained for military purposes since the 60s. US Navy. They were trained to rescue lost naval swimmers or to locate underwater mines.
Flipper is one of the most famous female dolphin.She was the main character of an american TV program in the 90s.