A dialog performance improvement method, system, and computer program product, include, computing a plurality of question classes and a confidence score for each of the question classes for a language input of a user, comparing the confidence score to an upper threshold and a lower threshold for each of the question classes to determine which of at least one action to perform, receiving a language feedback from the user for the performed action, and adjusting at least one of the upper threshold and the lower threshold based on the language feedback from the user.