The Road has genre Science Fiction
[Human]: Can you recommend books similar to The Road? [Assistant]: Do you enjoy this book because it is Post-Apocalyptic fiction or science fiction? [Human]: Yes. I love science fiction. Can you recommend similar titles? [Assistant]: You might enjoy the Way Station or Zoe's Tale since you like The Road. [Human]: Thank you. Who wrote those books? 
John Scalzi wrote Zoe's tale and  Clifford D. Simak wrote the Way Station.