Linda Lu held a beautiful home in Boca Raton. One day she looked around as well as decided that her house was in dire need of some updating. She appointed Charlie Chicto redecorate her apartment. She and Charlie spent some time debating her taste and her preferences in style. They came to an agreement as well as Linda Lu hired Charlie to redecorate her home. Charlie's responsibilities under the contract require a personal relationship with Linda Lu and demand his personal skill and judgment as a decorator. Unfortunately, Charlie is leaving town as well as now regrets agreeing to redecorate Linda's apartment. He needs to delegate his contract duties to Danny Decorator an equally skilled decorator. Under what conditions, if any, can Charlie envoy his contract duties?