A: Hi, I'm checking in.
B: Where are you heading to?
A: Chicago. The 3 o'clock flight.
B: All right, can I see some ID?
A: Here you go. My passport.
知识点讲解：
Check in
办理登机/办理入住
head to…
去…
I'm heading to the office.
我要去公司了。
I'm heading home.
我要回家了。
Chicago