Virtual Assistants, With Personality; Electronic Secretaries Can Be Charming, Funny and Frustrating
Computer-generated administrative assistants use speech recognition to manage telephone, E-mail and fax communications for busy people; growing number of people are using such virtual assistants, but there are tradeoffs; current limits of speech recognition technology make interaction with virtual assistants frustrating, and they speak and understand only preset phrases; they can be maddeningly literal and impenetrable; comparison of three systems that operate nationally: Portico, Wildfire and Webley; photo; drawing (M)