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Publication Classificati O SSCO acoustic properties associated with the user, invoke a virtual (51) Int. Cl. assistant; and in accordance with a determination that either GIOL 7/24(2006.01) the natural language speech input fails to correspond to a GIOL 7/26(2006.01) user-customizable lexical trigger or the natural-language GIOL 7/04(2006.01) speech input fails to have a set of acoustic properties GIOL I5/18(2006.01) associated with the user, forego invocation of a virtual GIOL 7/06(2006.01) assistant.