I JUST started doing that to my doctors ... I don’t know ... what are YOU doing April 4th .... is it a good day for YOU ?
If they asked, "No matter what. Regardless of fire, flood, or famine. Regardless if the doc butchers a patient and gets sued out of existence for malpractice. Regardless if you or your family have a serious injury, debilitating sickness, or a flat tire. You hereby GUARANTEE that you'll be here for your 9:15am appointment on April 4th. And, please arrive 15 minutes early for paperwork."
I'd take the Trump route, too. Because that's exactly what was being asked of him. All the conditions - no matter how unreasonable - were simply unstated.