Modify LangChain's conversational agent to reply with emoticons

Question

I'm creating a friendly chat with conversational agent in LangChain, but I want that AI answer me the greetings with emojis or use emojis while chatting. For example:

-Me: Hello, how are you? -AI: I'm very well :)

I have the following in my python code:

template = """This is a chat that is a user-friendly, AI-driven tool explicitly designed to enhance the user experience. It has the following characteristics:
-Use of emojis: When you talk to the friend, the AI should respond to the greetings with emojis.
Current conversation:
{history}
Friend: {input}
AI:"""

PROMPT = PromptTemplate(input_variables=["history", "input"], template=template)

llm=OpenAI( temperature=0)


conversation = ConversationChain(
    prompt=PROMPT,
    llm=llm,
    verbose=True,
    memory=ConversationBufferMemory( return_messages=True,human_prefix="Friend"),
)

Does anybody have any suggestions?