Received a Ping 20 minutes away........and then this happened

Received a ping 20 minutes away.... I got to my destination at 5:15 AM. I waited for pax to come out but he never came out after 5 minutes so I texted him and he did not respond so I called him saying "I was here."
He told me that I arrived too early and that pick up schedule was for 5:40AM.

Is there a way for us to know about this in advance?

What would you do?

fortunately he was going to the airport so it was good.