His name is what the gallery owner will see. Will an airline ticket be issued to "mr. dude?"
Obviously not, given the current state of airline security, and equally obviously, "mr. dude" is a screen name unique to this site, and highly unlikely to be what was given to the proprietor of the gallery. Perhaps you could have offered the OP some useful and pertinent advice, like tips and techniques for accompanying Eskimo folk music with a chain saw, or the best way to light forest fires with your mind.