请阅读下面对话,将适合的字词填入空格中: apologies economy class immigration announcement terminal Checking In M: Good afternoon, how may I help you? W: Hi, I“m flying to Shanghai. M: I“m sorry, but this 1 _________ is for domestic flights only. You“ll need to go to Terminal 2for international departures. W: But I was just there. I“m sure I heard an 2 _________ that said I should come to this check-in counter. M: Please accept our 3 _________ . There seems to have been a mistake. W:Will I miss my plane? I still need to check in and go through 4 _________. M: Don't worry, I“ll call the airline and let them know you“re coming. At the same time, I“ll also upgrade your seat from 5 _________ to business class. You shouldn“t have to wait long to check in. W: Thank you so much for your help.