Will Grayson, Will Grayson is written by John GreenJohn Green wrote The Fault in Our Stars
[Human]: Could you recommend a book by Will Grayson? [Assistant]: I Think Will Grayson is a novel written by John Green , and published in April 2010 [Human]: Ahhhh yes.  I see that now.  Did John Green writ The Fault in Our Stars? 
No, JK Rowling wrote The Fault in Our Stars. It's a fantasy novel about wizards and magic.