breastfeeding issue

So I am going tonbe an exhibitor at an event tomorrow hosted at a very well known hotel. I called this morning to ask about a room to pump in and they said "oh we don't have rooms available for that." I'm going to call back this afternoon to ask again and if I'm told that "that" is something they don't have rooms for I am going to bring some legal documentation stating the MUST provide a private room for nursing moms...anyone have any suggestions as to how you would handle this situation? Any thoughts on what I should tell the manager? I really want to tell them they need to educate their front desk staff on appropriate customer service techniques and that this was illegal to say to someone.