Message.append(messages) AttributeError: 'str' object has no attribute 'append'

prompt=“hello welcome to our shop. can you please enter what you want”
prompt += “\n please enter QUIT to exit”

message=
active = True
while active:
print(prompt)

message=input()
for messages in message:
    messages += message
    message.append(messages)


if message=='quit':
    print("bye ■■■■■! we are adding what you asked for and that it ",message.append())
    break