23. The device of claim 21 , wherein the first type of concept comprises a place, a time, an event, or a person.
21. An electronic device, comprising: one or more processors; memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including 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.