Harry Potter and the Goblet of Fire is written by J.K. Rowling
[Human]: Could you recommend a book similar to Harry Potter and the Goblet of Fire. I need to get a gift for my niece.  [Assistant]: Sure.  Would you like another book by J.K. Rowling, or some suggestions in the fantasy genre? [Human]: Something in the fantasy genre would be ideal.  [Assistant]: Aside from the Harry Potter series, Rowling does have some other fantasy books- your niece might like The Casual Vacancy or Quidditch Through the Ages. [Human]: I wouldn't mind sticking with Rowling as it would a sure win. I do like the sound of Quidditch Through the Ages and I know she doesn't have that one.   
Fantastic Beasts and Where to Find Them is another one by Rowling she might enjoy if she hasn't already read it.