Yes, it is possible to modify a reservation with Alamo. Customers are generally allowed to change certain aspects of their booking, such as the vehicle type, pickup or drop-off locations, and rental dates. The specific process for modifying a reservation may vary depending on how the booking was made, whether through the Alamo website, a mobile app, or a third-party service. Typically, customers can access their reservation details through the Alamo website by entering the required information, including the confirmation number. It is important to note that changes may affect the rental rates, especially if the changes involve extending the rental period or upgrading to a different vehicle category. Additionally, it is advisable to modify the reservation as soon as possible to ensure the availability of the desired options. For detailed instructions and any potential fees associated with changing a reservation, customers should check the current web page for more information.