15. The system of claim 11 , the operations further comprising: processing the voice input and the context to determine whether there is sufficient information to perform the action; and determining one or more missing parameters for the action when there is not sufficient information, wherein the potential contextual data comprises previously stored data specific to the user.
15. The system of claim 11 , the operations further comprising: processing the voice input and the context to determine whether there is sufficient information to perform the action; and determining one or more missing parameters for the action when there is not sufficient information, wherein the potential contextual data comprises previously stored data specific to the user. 18. The system of claim 15 , the operations further comprising: accessing data associated with other users; and identifying data that are potentially associated with the one or more missing parameters from the data associated with the other users.