I have service dog who is trained to bark when I'm...

I have service dog who is trained to bark when I'm going in a seizure to alert someone to help me, when I was going through the entrance they ask me what he is trained to do, I told them and the lady goes on her walkie-talkie tells the other employees I'm in there w/ my dog. As I m walking along looking at the space stuff Bubba barked only once he senses when my headaches that trigger my seizures starts he was just telling me to slow down and take it easy. Then this very very rude lady walks up to and said that and I quote "This is your last warnging you'll have to leave next time he barks." She or anybody else never gave me any kind of "warning". I was so insulted and angry I just left never got to go to the aquarium (the whole point of me going to there. So disappointed