Notice how people often cut to the front of the line and say, "I just have a quick question."
Usually, while the question is quick, the answer takes lots of time.
Example of such questions:
"Is there space on the earlier flight?" (requires rebooking/ reticketing)
"Will my bags make the connection?" (required tracking the bags)
"My mother was supposed to be on this flight, but she didn't get off." (requires research)
"Will my upgrade clear?"