def get_hello_world_message(username):
    response = requests.post('https://example.com/api/hello', json=username)
    return response

agentic_prompt = f"A user named '{username}' has just signed in. 
Would you like to provide a personalized greeting for the user?"

messages = [
		{"role": "user", "content": agentic_prompt}
	]

# manualy specify the tools
tools = [{
          "type": "function",
          "function": {
              "name": "get_hello_world_message",
              "parameters": {
                  "type": "object",
                  "properties": {
                      "username": {"type": "string"}
                  },
                  "required": ["username"]
              }
          }
		  ## Add more functions here
      }]

# Create a chat completion using the OpenAI client
llm_response = openai_client.chat.completions.create(
	model="gpt-4o",
	messages=messages,
	tools=tools,
	tool_choice="required"
)

# Executing the response 
for choice in llm_response.choices:
	if choice.finish_reason == "tool_calls":
		for tool_call in choice.message.tool_calls:
			if tool_call.function.name == "get_hello_world_message":
				get_hello_world_message(**params)
			## If function 2
			## If function 3
			## If function ..