He asks her about what it was like growing up as a Muggle, and what she'd thought of Diagon Alley the first time she'd seen it, and what she dreamed of being growing up, and how cars worked, and what she'd wanted to be when she grew up before she'd known she was a witch, and where she went for holidays, and what flying in a plane is like... Malfoy is all questions, and he listens with interest, prodding for details with lighter topics, and respecting any shorter answers with things that are more personal. She entertains him as best she can, trying to sustain his cheerful mood by relating Muggle jokes that she's sure she botches terribly, and explaining Muggle technology, and idiosyncrasies, and traditions.