1. One or more computing devices comprising: one or more processors; one or more computer-readable media storing computer-executable instructions that, when executed by the one or more processors, cause the one or more processors to perform acts comprising: receiving a first audio signal generated based on a first sound captured within an environment; identifying first speech from the first audio signal, the first speech including a wake word; receiving a second audio signal generated based on a second sound captured within the environment; determining that the second audio signal includes second speech; determining whether a user that spoke the first speech is the same as a user that spoke the second speech; causing performance of an action associated with the second speech at least partly in response to determining that the user that spoke the first speech is the same as the user that spoke the second speech; and refraining from causing performance of the action associated with the second speech at least partly in response to determining that the user that spoke the first speech is not the same as the user that spoke the second speech.