The thing is, I booked a round-trip ticket from SG-Nui Ba Den, the ticket stated the service time as 4:30-18:00, but when I had finished booking and transferred the money, the service provider called to choose the departure time and seat, but there was one problem: I booked the ticket on the evening of June 30 to use on June 1, on the morning of June 31 the service provider called me to choose the seat and time, because I booked the ticket close to the date so there were few options, when it came to the return time, the service provider said there were no more buses now, only the 15:00 trip was the latest, because the later time slot was full. I asked why I booked the ticket because the time slot was 18:00, why did they say there were no more buses at 15:00, then what could I do? The service provider said there were no more buses now, what do you think, so I had to accept that time slot and the next day we agreed to give up the return ticket, stay and play until we wanted to go back, then I called another bus to go back. That made me feel very uncomfortable and uneasy during my trip.