[Oh yes, the movie. Seeing the lifelike dragon appearance had made him momentarily forget his role. After his keen sense of smell tells him this is a costume, he picks up from his momentary fumble and starts to run with it.]

I have heard tell of how dragons love riddles, and my curiosity got the better of me. So how about this: if I defeat you in a battle of wits, you let me have one of your treasures. If you win, however, you can have me as your reward.

[He tries his best to sound like a confident-yet-cocky adventurer, like he believes the battle has already been won. Nobody tell him that he's actually cocky though, he won't believe it.]