Reservations?

I was driving to lunch today when I spotted something interesting, a sticker on a car wrote;

"Heaven or Hell: Have you made you reservations?"

I'll admit that it was intriguing, but then I pondered; 'Do I need to make a reservation to Hell?' Then what if I wanted to make a reservation to Heaven? Whom should I see or call? 
Can we just make a call to Heaven, or straight to St. Peter & demand that we're coming to Heaven at about 70 years old?

Ha, if only life was that simple.