==== What to do on failure ====
**// Tailor the action after a dialog state failure according to call center status, other options for completing the task, and the importance of receiving a response //**\\
When, based on the number of reprompts given or counts of noinput/nomatch/help, callers appear to be in trouble, there are several design options ([[references#lewis2011|Lewis, 2011]]):
    * Switch to touchtone (especially if the problem appears to be related to speech recognition -- e.g., multiple nomatches)
    * Point the callers to an alternative means of accomplishing their task (e.g., a website) -- especially if there is no call center or it isn't open
    * Transfer to an agent (if there is an open call center)
    * Offer a callback option (if the call center isn't open or if the expected wait time is unusually long)
    * For non-critical dialog steps (such as asking callers if they want something repeated), accept the failure and keep going. It might sometimes be necessary to provide a transitional prompt, e.g., "No problem, let's move on."

==== References ====
Lewis, J. R. (2011). Practical speech user interface design. Boca Raton, FL: CRC Press, Taylor & Francis Group.