The Princess Diaries is written by Meg Cabot
[Human]: I like the book The Princess Diaries. Do you know who was the author? [Assistant]: That's a great book. It was written by Meg Cabot. Did you know it was also made into a movie? [Human]: Really? That's great. I would like to know more books written by Meg Cabot. [Assistant]: Sure. She also wrote Underworld, Twilight and a series Queen of Babble books. [Human]: Thank you very much for the recommendations. I'll take a look at those books. 
You're very welcome. Anything else I can help with?