May I see your ticket and passport , PLS ?   Sure , here they are .   Any luggage ?   Just this suitcase .   Your backpack is very big and today's flight is quite full . I am afraid that you will have to check your backpack too .   No problem . What about this carry-on ?   You can take that with you .   Can I have an aisle seat , PLS .   No problem . I'll give you an aisle seat in the center row . And here is your ticket , passport and boarding pass . Please board the plane at Gate 15 .   Thank you . And when is the latest time for me to board the plane ? 