while True:

    want_instructions = input("do you want to see the instructions? ").lower()

    # check the user says yes / no
    if want_instructions == "yes" or want_instructions == "y":
        print ("you entered yes")
    elif want_instructions == "no" or want_instructions == "n":
        print ("you entered no")
    else:
        print("please enter yes / no")

print("we done")