Respective scheduled network maintenance activities are scheduled for the following periods, 22:30 Apr. 16th until 00:30 Apr. 17th GMT 22:30 Apr. 17th until 00:30 Apr. 18th GMT 22:30 Apr. 21th until 00:30 Apr. 22th GMT   During the maintenance period, window access to the Online Reservation service will be unavailable for up to approximately 2 hours. We apologize to make you inconvenient.