They were going to take a holiday in Danang and had already booked their flight.

Their flight to Danang was cancelled, so the holiday they had booked went to waste.

They had planned a vacation in Danang and had even made their flight arrangements.

They couldn't go to Danang in the end because they forgot to make arrangements for the flight in advance.

They decided against a holiday in Danang in spite of having paid for their plane tickets.