IMHO - Be a Professional Pilot, when interrupted by a rude passenger, do the best you can to help them with a smile and a kind word. We might not know where their flight leaves from, but we probably know where the information can be found.
Often passengers are running late due to no fault of their own and their stress is a normal reaction - after all we will leave them at the gate if they don't connect in time. If I can help someone with my ALPA pin and bag tags in plain view, I hope that passenger goes away with a better impression of airline pilots and of our association.
I once heard a senior US Attorney (two levels from the President of the US) relate a story how as a child she got lost at CVG and a Delta Pilot helped her find her way back to her father. This made enough of an impression on her that she still talks about it 28 years later and candidly, she holds Delta pilots on a pedestal as a result to this day.
After all, take a deep breath, forget all the Reguest for Proposal garbage for a second and enjoy smiling back at the kids that smile at you. They go back and draw pictures that they want to be airline pilots some day. Our percentages against Firemen have fallen in recent years and darned it, this is a better job that going into a burning meth lab, or an apartment complex engulfed in flames at 02:30 in the morning.
Even the backpacker pilots with the ear buds have the newest Ipod'o'Treo with WiFi. Show off that internet connection. Starbucs has free wireless and every airline (except for AirTran ) has a site where you can get current flight & gate info. These are our customers who pay for those jets we get to scoot around in. Go ahead and hate airline management for the stupid schedules and lousy service that get these people so jacked up to begin with, but don't hate the customer.
This post should be required reading for every new hire pilot in the industry. Bravo, sir!