A reservation can be opened in several ways.
In the cockpit find the reservation needed and doble click on it and the reservation will open with all the details of the customer.
Another place you can open a reservation is on the side bar in the cockpit. Onece you click on the reservation needed all the details will apprear on your sidebar click on the word edit and your reservation will open up with all the necessary information.
On the Reservation Tab (Room Rack) you can also find the reservation needed and once again double click on it and it will open up withh all the necessary information.