A booking should be in writing before the vehicle moves. The hour you agreed on the phone should also sit in the message. Without a flight number the driver cannot see a delay. Without an address the drop-off is a guess.
A short checklist
Date and time, pickup and drop-off, passengers, child seat, luggage and the return. Check that the vehicle is named as a Vito, a Caravelle or a Sprinter. If there is waiting, see whether that time is inside the fare.
If the hour changes after the confirmation, send it at once. +90 507 047 39 94 and WhatsApp land on the same line, so the car stays on your clock.