Exia Reservation System (Exsersys) is a low investment online reservation system that use public internet as its communication network. The use of public internet makes it simple and low in investment for the airline and/or the agent. The airline and the agent simply provide an internet connection and a standard computer (windows) with internet explorer installed in their sales office. Exsersys is made easy to use and easy to understand. It’s GUI (graphical user interface) easily understandable to any user and it’s follow us method easily guide the user to operate the system sequentially. Exsersys provides better function of reservation i.e. protects unapproved time limit extension. It also provides inventory management function; accommodate multi leg flight and multi class fare. For better utility, a messaging facility is installed to ease communication between sales points.