How can i make my python3 code do many "if input" operations at once

I tried make an AI just to see if i could, i couldn't. but i want it to at least work. Here's my code:

if True:
   if input(":") == "hello":
       print("Hello.")
   if input(":") == "good bye":
       print("Bye!")
   if input(":") == "how are you":
       print("Good, i don't feel much. You know, I'm an AI.")

if you run it you see that it does not what an AI would do.