A contact center server accesses queries provided by user devices. The contact center server determines a confidence score representing a likelihood that a query of the queries matches an intent using an intent matching engine. The contact center server matches, via the intent matching engine based on the confidence score exceeding a threshold, the query to the intent. The contact center server provides, to a client device, a subset of the queries that are not matched to any intent. The subset is identified based on confidence scores. The contact center server receives, from the client device, data representing an intent that matches at least one query in the subset. The contact center server trains the intent matching engine based on the received data.