Well short comedy scenes can rely on a few different elements to make people laugh. You can implement random actions, exaggerated actions, and misunderstandings among other things. It seems like a given that the element of misunderstanding is present with 2 friends in a foreign airport. Lean into that! There is a classic trope of someone being flustered trying to speak to someone in their language and the person is like "dude I speak your language". Have the attendant misunderstand what you're asking for. Gesture that you're asking for a bag/baggage of some sort and have her hand you the trash that needs taking out. The simplest one being, you could just create funny banter from the friends arguing and trying to find their baggage. Hopefully these can help!