Reservations can be valid for a few hours up to a maximum of 7 days, depending on the distance of the flight and the airline. For example, if you book a flight for tomorrow, the airline can give you a valid ticket, but the reservation will be closed after a few hours or the next day due to the airline's interests. They close the reservation in order to be able to sell the latest flight tickets before boarding the flight. We try to keep reservations valid for as long as possible, so we recommend not taking tickets for upcoming dates (at least 10 days later) to reduce the service life of the reservation.