Sometimes flakiness is good. Like when you’re talking about flaky pastry. When you’re talking about a human quality however, flakiness is an extremely annoying trait for someone to have. If you set up a meeting, a dinner, or any other sort of arrangement with another individual, follow through. Obviously emergencies do come up. That is understandable. But in terms of normal, everyday life, if you make plans, keep them. Show up. People will respect you for it because they know you value them because you value their time.