22. The method of claim 6 , wherein the audio signal is a first audio signal, wherein the user speech is user speech, and wherein the intent is a first intent, the method further comprising: receiving a second audio signal that represents second user speech from the speech interface device, wherein the second user speech indicates a second intent; performing natural language understanding on the second audio signal to determine the second intent; and providing a second indication of the second intent to the speech interface device.
23. The method of claim 22 , further comprising determining that no application for responding to the second intent has been selected by the user for execution on the one or more server computers.