19. The system of claim 17 , wherein determining whether the speaker of the user speech is the predetermined user based at least in part on the speaker profile for the predetermined user comprises: determining whether the audio input comprising user speech matches at least a threshold number of the plurality of voice prints; in accordance with a determination that the audio input comprising user speech matches at least the threshold number of the plurality of voice prints, determining that the speaker of the user speech is the predetermined user; and in accordance with a determination that the audio input comprising user speech does not match at least the threshold number of the plurality of voice prints, determining that the speaker of the user speech is not the predetermined user.
17. The system of claim 14 , wherein the speaker profile for the predetermined user comprises a plurality of voice prints.