Follow the coins

You enter the cavern and you are surprised, inside is like a palace, steam rises from the baths built in the natural streams of hot water. The air is warm, and you listen to fires, you notice decorations and art pieces like sculptures and painting hanged on the walls. Then he steps into your path, a huge man half-human half-dragon with black scales.

"You are either very brave, or very foolish" he grunts
"My father is tired of you?" he asks, and observes your movements, after a small pause he continues "Or my mother sent you to change my mind? speak quickly human."

Say the truth, and beg for help.
Lie and say that his father or mother sent you.