Who do I contact if my plans change on the day?

Anything affecting a flight. A rebooked departure, a gate change that moves your timing, a cancellation. Those cascade into the collection, the terminal and sometimes the car park, and the earlier we know, the less of it you have to think about.

Anything affecting the vehicle. A fourth passenger, three extra cases, a child seat suddenly needed. Those cannot be solved at the kerb and can almost always be solved with an hour's notice.

Call the chauffeur first, then reservations if there is no answer within a minute. In an airport car park a phone may not connect, which is exactly why the office line exists and why it is answered rather than routed to voicemail.

At a terminal, stay where you are rather than walking. The chauffeur is looking for you at a known meeting point, and two people moving through an arrivals hall in opposite directions is the classic way to turn five minutes into twenty.

If a car is delayed by something we cannot control, you are told directly rather than left watching a road. The message says what has happened and what the revised time is, and where a delay is going to matter, another vehicle is put on it instead.

That contact goes to the booker, and to the passenger if they are a different person and you have said we may reach them. Nobody should discover a change by standing outside a building wondering.