British Columbia - With the rise of each new generation, change overtakes conventional wisdom. As the late Johnny Cash sang, “And the lonely voice of youth cries, ‘What is truth?’” Whether presenters were able to offer definitive guidance to a new generation of consumers last week in Vancouver, during one of North America’s biggest wine festivals, is another question.When panelists filtered out of the Morris J. Wosk Centre for Dialogue here following a symposium about truth in labeling that was part of the Vancouver Playhouse International Wine Festival, about all that was certain was that consumers want truth.