Give the vehicle details first.
The year, make and model help establish which key system is involved. Mention whether you have a spare that starts the vehicle. Support varies, so check your particular car before arranging a tow or buying a part.
Be specific about the parking place.
At a park or waterfront destination, the main street address may cover more than one parking area. Note the entrance, nearby sign or row. If you're farther south in Charlotte, the deck name and level are more useful than simply saying Uptown.
Keep a damaged key available.
If the blade is bent, the case has broken or a piece remains in the lock, describe that. Avoid pushing harder or trying to force another object into the opening. A useful explanation is enough; you don't need to diagnose it yourself.
Know when the job becomes a replacement.
If the key is missing, ask about replacement keys and programming for the exact vehicle. Opening the door alone won't give you a working ignition key. Explain both needs at the start so you can compare the full scope.
A couple of common questions.
Can you work on a rental vehicle?
The rental company needs to authorize the work and may have a process you must follow. Contact it before arranging a separate service.
What if the car is running?
Say so immediately, along with whether anyone is inside. If a person or animal is in danger, contact emergency services rather than waiting for an ordinary service visit.