Driving in circles

Mr. Epazil: "Hello?" 

Mary: "Hi, Don. This is Mary, at Dr. Grumpy's office. I'm just calling to confirm your appointment for 8:30 tomorrow morning." 

Mr. Epazil: "Actually I'm glad you called. I need to make an appointment to see Dr. Grumpy."

Mary: "You have an appointment for tomorrow morning. Will that work for you?"

Mr. Epazil: "It should... Actually, I may need to reschedule. It looks like I already have an appointment for 8:30 tomorrow, with my neurologist."

Mary: "That's Dr. Grumpy, so you're good."

Mr. Epazil: "Where are you calling from, anyway?"

Mary: "Dr. Grumpy's office."

Mr. Epazil: "What kind of doctor is he?"

Mary: "Dr. Grumpy is a neurologist."

Mr. Epazil: "Okay... That sounds like a good idea. Can I make an appointment to see him?