This is book number 1 in the The Chronicles of Kazam series.
Monty Python comes to the middle-grade novel. Magic is draining from the world and magicians are getting testy. They’re a lot harder to manage these days, and 15-year-old Jennifer, former foundling and current head of Kazan Mystic Arts Management (levitating carpets for cleaning purposes and pizza delivery, etc.; general magic-for-hire) has her hands full. And that’s before she’s elevated to the position of the Last Dragonslayer— particularly since the Last Dragon is such a quirky, lovely character. Clever, imaginative, and silly; for Terry Pratchett fans.— Ga
"Fforde's fantasy is smart, funny, and abundantly imaginative in its critique of commercial culture."--Horn Book