"No, human child, I am very real."

Fear. Yes, that seems about to be expected. He isn't attacking, though. So, there is that.

"I am Asgore Dreemurr, the King of all Monsters in the Underground, now... set free from my prison and taken into the outside world through some strange magic -- a human spell, surely. Tell me, what human village is nearby? Is Mt. Ebott somewhere near?"