while True:
    want_instructions = input("Do you want to see the instructions? ").lower()

    # do they want instruction

    if want_instructions == "yes" or want_instructions == "y":
        print("You said yes")
        break
    elif want_instructions == "no" or want_instructions == "n":
        print("You said no")
        break
    else:
        print("Please enter yes / no")
        continue

print ("We are done")