Just bought my first drone, a P4P and was readying for my first flight yesterday (Sunday afternoon - it didn't happen). I called a private airport and a local hospital helipad that are in my local area to notify them I planned to fly within 5 miles of their location. I pulled their info off the AirNav database and had distance and bearing info to pass along, but the airport never answered and whoever answered at the hospital sent me to their engineer voicemail. Since I couldn't notify them properly, I cancelled the flight. I just took and passed my Part 107 knowledge exam and didn't want to risk losing it on my first flight. What's the policy if you try in earnest and can't get through?