9. A system, comprising: a processor; and a memory storing instructions that, when executed by the processor, cause the processor to perform operations, the operations comprising: receiving an audio signal generated from speech spoken by a user; recognizing a portion of the audio signal that corresponds to a command prefix, the command prefix representing a spoken word that indicates a next spoken work is a voice command; identifying another portion of the audio signal corresponding to the next spoken word after the command prefix; recognizing the next spoken word based on the another portion of the audio signal; comparing the next spoken word to electronic associations between vehicular commands and words including the next spoken word; recognizing a vehicular command of the vehicular commands that is electronically associated with the next spoken word; and executing the vehicular command in response to the speech spoken by the user.
15. The system of claim 9 , wherein the operations further comprise generating a message to a recipient identified by the speech spoken by the user.