14. The computer-implemented method of claim 8 , further comprising generating third text using the first text and the intent definition, wherein a portion of the third text matches the first text, wherein the third text corresponds to a third textual expression included in the intent definition, and wherein the third textual expression includes more information than provided via the first textual expression identified by the first intent definition.
8. A computer-implemented method comprising: under control of one or more computing devices configured with specific computer-executable instructions, performing automatic speech recognition using audio data received from a client device to obtain a transcript of the audio data, the transcript including first text for the audio data; selecting an intent definition from a plurality of intent definitions, the intent definition selected based on a first textual expression included in the intent definition and on the first text; and generating second text using the first text and the intent definition, wherein the second text corresponds to a second textual expression included in the intent definition, and wherein a portion of the second text matches the first text.