Python 如何不断重复输入语句？

我是Python新手，一直在尝试开发聊天机器人。这是密码

print("Hi! I am AUGbot")
x = input()
if x == "hi":
    print("Hello!")
elif x == "hello":
    print("Hi!")
elif x == "how are you":
    print("I am fine! How are you?")
elif x == "i am fine":
    print("Nice!")
elif x == "i am not fine":
    print("Oh, Sorry to know that")
else:
    print("I am not sure I understand")

代码执行后，它将结束。即使在用户给出输入后，我如何保持输入语句运行？非常感谢您的帮助。

以下是完整的代码：

print("Hi! I am Jarvis.Let me know, how i can assist you?")
while True:
    user_input = input("Leave Your Message...")
    if user_input == "hi":
        print("Hello")
    elif user_input == "hello":
        print("Hi")
    elif user_input == "how are you":
        print("I am fine! How are you?")
    elif user_input == "i am fine":
        print("Nice!")
    elif user_input == "i am not fine":
        print("Oh, Sorry to know that")
    elif user_input == "exit":
        print("Thank you!")
        break
    else:
        print("I am not sure I understand!Type Again")

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你知道吗？你试过使用它们吗？谢谢你的回复。我对Python有点陌生，所以我不理解while循环的概念。你能帮我吗？Stack Overflow不是为了取代现有的教程或文档，也不是为你完成研究、设计或编码工作的方式。非常感谢！