45. The computer-readable storage medium of claim 39 , further comprising instructions for: identifying a second type of concept referred to by the primary user intent; identifying a second substring from the textual representation corresponding to the second type of concept; and determining a secondary user intent for the second substring, wherein performing the task flow is further based on the secondary user intent for the second substring.
39. A non-transitory computer-readable storage medium comprising computer-executable instructions for: receiving an audio input comprising user speech; converting the user speech of the audio input into a textual representation of the user speech; determining a primary user intent for the textual representation; identifying a first type of concept referred to by the primary user intent; identifying a first substring from the textual representation corresponding to the first type of concept; determining a secondary user intent for the first substring; and performing a task flow comprising one or more tasks based at least in part on the primary user intent for the textual representation and the secondary user intent for the first substring.