Really as much as you want to do. Personally I will help if I can. I do not have access to any of the computer systems, so I cannot find what gate your connection is, what the delays are, etc. Really the only info we get is related to the flight we are operating. That being said, If I see someone ask a simple question to a gate agent, and then get treated rudely (which happens all the time at the airport I fly out of), I will offer whatever help I can.