while True:

    want_instrusctions = input("Do you want to see the instructions? ").lower()

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

print("we done")