Before revision:  Assuming a correlation between engagement and user responses such as "liking" messages or asking followup questions, we design a Wizard of Oz dialog task that tests the hypothesis that engagement increases when users are presented with facts that relate to their existing knowledge .
After revision:  Assuming a correlation between engagement and user responses such as "liking" messages or asking followup questions, we design a Wizard of Oz dialog task that tests the hypothesis that engagement increases when users are presented with facts related to what they know .