It is tedious to get animals to respond to conditional signals. It is very easy to train and to untrain humans. The connection is immediately formed and a cooperative person lifts her right hand when I say 'red'. Even though they talk, humans, too, respond to quick, appropriate rewards. People are especially responsive to a positive emotional climate and they respond eagerly to an atmosphere of praise and positive responses to successful performance.
People also respond very well to positive requests.
Positive requests to do something are easily understood and easily carried out. Even though some statements sound like requests, they are really only invitations to fight. Each one of these is worse than the one before. Actually they all increase unwanted actions. If you want your human 'Shamu' to perform, then make simple, direct, positive requests to do something.