Car rental agents help customers who need to rent a vehicle. Some rental agencies refer to this position as a front desk clerk because you carry out most of your responsibilities at the front desk, either assisting customers with their rentals at the agency or answering and making phone calls. In this role, your job duties include greeting customers as they arrive, explaining the rental and paperwork process, upselling insurance and mileage packages, answering customer questions and concerns, assisting customers who have an issue or emergency with their rental vehicle, and updating the rental car inventory when a customer rents or returns a car.