Farsical

I thought I'd go see the doctor. I phoned up for an appointment. First one with Dr David. "He's fully booked this week and then has a fortnight's holiday", receptionist informs me. Great.
Ok well first available appointment with any doctor. "Next Thursday 11th August", She gives me.
"A week!" I exclaimed.
Well unless I phone on the day at 0830.
"So am I too late for today?"
"No", she said "I have one at 4.30pm".
"Who with" I ask
"Dr David"
Am I going mad?