Python Infinite loop for raw_input (conversation simulator)

Question

In my code, my goal is to have a code that lets you talk to something. I've been doing:

one = True
two = False
three = False

typed_input = raw_input("Type here: ")
    #first
if one == True and two == False and three == False:
    if typed_input == "blah":
        do something
        typed_input = raw_input("Type here: ")
        one = False
        two = True
        three = False

    elif "the" in typed_input:
        do something else
        typed_input = raw_input("Type here: ")
        one = False
        two = True
        three = False

^ repeat for 2 and 3 ^

how do I get a infinite loop?