Years before she made a splashy debut with her award-winning graphic novel “Stone Fruit,” the Montreal-based cartoonist Lee Lai spent years working in cafes and restaurants. That experience got her thinking about some big questions, like what does it mean to be of service? What happens when someone is used to giving but never receiving? And when you change your life for the better, will your friends and relationships support your personal growth? Those questions form the core of Lee’s new graphic novel “Cannon,” which follows a line cook who has trouble asserting herself and setting boundaries. She joins Tom Power to talk about it.