import random

responses = {
    "hello": ["Hi there!", "Hello!", "Hey! How can I help you today?"],
    "how are you": ["I'm just a bot, but I'm doing great!", "I'm doing well, thank you!"],
    "bye": ["Goodbye!", "See you later!", "Take care!"]
}

def chatbot():
    print("Chatbot: Hello! Type 'bye' to end the conversation.")
    
    while True:
        user_input = input("You: ").lower()
        
        if user_input == "bye":
            print("Chatbot: Goodbye!")
            break
        elif user_input in responses:
            print(f"Chatbot: {random.choice(responses[user_input])}")
        else:
            print("Chatbot: Sorry, I didn't understand that.")

chatbot()