>>> while True:
    s = input("Enter yout idea : ")
    if s == "Why?":
        print("We need it to book")
    s = input
    if s == "What book?":
         print("RedBook from Rubia")
    s = input
    if s == "Ok":
         break
    elif s == "No":
        print("Good bye, bitch")
        break

Enter yout idea : Why?
We need it to book
Enter yout idea : What book?
Enter yout idea :