Mary: "Sir, we don't have you listed for an appointment. In fact, it doesn't look like you've ever seen Dr. Grumpy."
Mr. Lost: "You're wrong! I have an appointment right now!" (whips out appointment card, hands to Mary).
Mary: "Um, your appointment is with Dr. Darth, the neurologist across the street. You're at the wrong doctor's office."
Mr. Lost: "So you people screwed up my appointment? Dammit!"
Mary: "Sir, your appointment isn't at this office. I'll call over to Dr. Darth's and let them know you're on your way. Do you know how to get there?"
Mr. Lost: "Of course I do! Where is it, anyway?"
Mary: "You go back to the street and make a left turn, go 1 block down, make a right, and it's the 3rd building on the left. Here's the address."
Mr. Lost: "I don't want to pay a co-pay, since this is you people's fault."
Mary: "Well, you can discuss that with his staff when you get there. I'll call now and tell them you're coming."
Mr. Lost: "My car is low on gas. Can you drive me to his office?"