You ask Moonflower where you can find fire peppers.

Moonflower: "Well, they grow in the desert, but most spice shops sell 'em. I think."

Windcaller returns from his house with two pillows on his back, and a musical instrument strapped around his neck. Once upstairs, you and Moonflower welcome him back, and he nods in response.

Moonflower: "Oh, cool! What'cha got here?"

Windcaller: "Ah... it's a vessel flute. I can... play it later, if you'd like."

Windcaller puts the pillows down on the bed, and the flute on top of the bookcase.