27. The computer-program product of claim 23 , wherein the non-transitory computer-readable medium further includes instructions that, when executed by the one or more processors, cause the one or more processors to perform operations including: determining an objective associated with the current dialog session; and using the unstated characteristic to determine whether the objective associated with the current dialog session has been fulfilled.
27. The computer-program product of claim 23 , wherein the non-transitory computer-readable medium further includes instructions that, when executed by the one or more processors, cause the one or more processors to perform operations including: determining an objective associated with the current dialog session; and using the unstated characteristic to determine whether the objective associated with the current dialog session has been fulfilled. 28. The computer-program product of claim 27 , wherein the action is modified using a result of determining whether objective associated with the current dialog session has been fulfilled.