Abstract: Embodiments of the present invention provide apparatus and methods for efficiently modifying existing travel reservations stored in a GDS using a graphical user interface for issuing commands to the GDS. These include commands that would typically require manual entry of commands and arguments using a command-line interface. The graphicaluser interface can be displayed on a display device of a computer system and used by an agent to modify the reservation by selecting a different flight, to change seating arrangements, to meet basic needs, such as wheelchair assistance and food accommodations, and to help reduce any costs charged to the user as a result of the changes as the modifications can be entered more quickly and with fewer errors.