Hello how may I help you? hi hi Hello! How are you? What can I help you with? i want to know about a book I can help you with that! What would you like to know? books written by rick riordan The Lightning Thief, The Lost Hero, The Sword of Summer. There are more. Should I go on? yes please The Red Pyramid, The Hidden Oracle, The Dark Prophecy. There are more should I continue? wow thanks Your welcome! Do you have anymore questions today?