We booked our vacation in July 2018, nearly a year before our trip. We booked online through Orbitz, and the third party service used Air Canada for the flights from Detroit to Punta Cana through Toronto, Canada. We arrived 3 hours early for our 6:40 a.m. Air Canada flight from Detroit to Toronto, and were the first in line when the desk opened. When we checked in, the employee indicated that something was wrong and to go to the gate for our seat assignments. Later when the same employee was at the gate, she said that we would not get on the flight despite the fact that we booked our trip a year in advance, because someone at Orbitz neglected to sign us up for seats and the flight was overbooked. Despite contacting Orbitz, we were unable to get on a flight that morning that could get us to our destination approximately the same time. We missed a day at our all-inclusive resort and had to take three flights to get there. During the hours we attempted to get another flight, the Air Canada employee told us that Orbitz failed to book a return leg of our journey from Toronto to Detroit, and she took the initiative to book us on a flight. The only thing the Orbitz representative offered to do for us was provide $200 to use toward any future travel, as if I would trust Orbitz for any of my future travel arrangements. In addition, during the 8 months preceding our trip, our flights were canceled twice. We had to spend hours on the phone with a customer service representative to book another flight. Each time someone notified us, the flights got worse with respect to times and number of layovers each way. During the two times I spoke to a customer service representative at Orbitz to get us on another flight, no one ever told us they failed to reserve our seats.