Dear $title $lastName,
We are very sorry to inform you that we are unable to confirm your reservation request for a Group $carGroupCode ($carGroupMakeModel or similar) car at $rentalLocation. This is because the selected car group was not available at this rental office.
Why not try another car group or rental office. Alternatively, you can call the rental office directly to find out what else is available - $rentalLocationPhoneNumber
We apologize for the inconvenience caused and hope that you will consider Budget for your next rental.
Thanks and Kind Regards
Your Budget Team