I find that a simple smile with gentle eye contact and an inner prayer of God's blessing to the fascinating people I pass along the way often receives a smile in return. They sometimes seems grateful that someone took the time to care about them for a bit. And I've been surprised how some see that as an invitation to talk a bit, sometimes even to share some concern they have, giving me opportunity to express encouragement in response. It can't be forced, of course, but can be welcomed and can close with a simple blessing -- e.g., may things go well for you, God bless you. It is amazing how thirsty nearly all of us are for a gentle, sincere blessing.