1. A system for communicating with a user via a spoken dialog service, the system comprising: a module configured to select a dialog motivator from a plurality of dialog motivators based at least in part on user input, the plurality of dialog motivators including an assumption dialog motivator and a confirmation dialog motivator; and a module configured, when the spoken dialog system requests further user input and invokes the confirmation dialog motivator to confirm the further user input, to: receive the further user input; and if a confidence value associated with understanding the further user input is below a threshold value, invoke the assumption dialog motivator to present assumed further user input during a confirmation dialog.