A concert violinist received an offer by mail to play a concerto with a local symphony orchestra. She checked her schedule, and thinking that she had the date free, mailed a letter to the symphony orchestra accepting the offer. Later that day, as she was checking her calendar about another matter, she realized that she had a rehearsal for another performance on that date. The violinist called the orchestra manager and declined the offer to play the concerto. In a breach of contract action by the orchestra against the violinist, will the orchestra prevail?