Hi. I'm trying to book a sleeper on the overnight train from Ninh Binh to Hue on both 12go.asia and baulao.com. On both sites, it says that everything is sold out on the date I want. However, when I check the same train from Hanoi to Hue, the seats/sleepers are available. So, would it be OK for me to purchase the sleeper on the Hanoi to Hue train, but board the train in Ninh Binh, or would my sleeper be forfeited (and me considered a no-show) if I don't board in Hanoi?