Welcoming new players
Look and see if they appear at the point new accounts enter the game (which is not right at a gate or WP). That will only eliminate alts entering the zone, but if they look a bit confused the odds are they are new. For example, I was used to something that uses the arrow keys for left/right when I joined …. so was moving rather oddly until I remapped things.
You can also friend them and then look at them in your friends list. If they have thousands of AP, they aren’t new.
Also try saying different lines every now and then. “New? I’m here to answer questions.” “Hi, welcome to Tyria! I can help you figure things out if you want!” /bow @ (targeted player), /em stands ready to answer questions, just use /say to talk. “Glad to see you! Any questions about the game so far?”
Etc.