During the summer high season and a few other times throughout the year, tickets booked at the last minute can become sold out before we have a chance to complete your order. It happens in less than 1% of cases. For Vietnam Railways we will email you a list of possible options and as soon as you reply we will book your alternative. If there is no alternative we will refund you in full. For the private railways, we will automatically switch you to a provider of equal price and comfort level should your desired train become unavailable. There is nothing you need to do in this case, we will simply book the available train for you and send you an email notifying of the change. We promise that there will be no noticeable difference in the quality of service for the new booking.