It would be like talking to one's car. Play is part of learning, the learning part of the play. Play is serious and engaging. Play is voluntary. The mystique of the invincible computer is quickly dashed as soon as one works with it.
Computers do language quite poorly in comparison with humans.
Rather than apologize for the language errors of computers, see them as a resource. The only sure way to avoid the computer making errors with language is to severely restrict the answer possibilities of the student. The more one frees the student to use real language, the greater the possibility the computer will misinterpret it or make errors. Yet this also provides for a richer language learning environment. Within reason, use these errors as a resource.