You don't have to pay for your flights - they're included in the price of your holiday.你不必付机票钱，票款已含在度假的费用中。The holiday was cancelled so the travel agency had to refund everybody the price of the tickets.度假行程取消了，所以旅行社不得不把票款退还给所有人。Have you paid for the tickets?你付票款了吗?