Wow! What a fabulous TR!!! I can't personally why EI agent having a problems with your next flight ORD-DFW. You were trying to called airlines to given out your ticket counter and you have to brings your flight itinerary along with you next time.
I am embarrassed what happened of your trip in DUB. She wasn't rude you at all? You have be respected with EI agent and lets EI agent is doing their jobs. You probably know better that you can't called from your US cell phone in EU. Because it is too expensive. You have wait to get it back to USA. It will costs too much money that you called from Ireland.