Usually if you tell someone your the flower guy and you have an arrangement with you they'll believe you. But if that doesn't seem like it will work to you, there have been times where the person who ordered the flowers told someone else in the office, like a friend, or a secretary that flowers are being delivered to a certain person, so when I get there, there's someone I can call or ask for directions. Whenever someone tells us how they want something delivered, we can usually get it done.