Connect AI Agent via postman

or is this documentation any use ? https://learn.microsoft.com/en-us/rest/api/aifoundry/aiagents/create-thread-and-run/create-thread-and-run?view=rest-aifoundry-aiagents-v1&tabs=HTTP - at this point you specify the agent 

in the body if you try sending something like this does that work ?

{

        "messages": [

            {"role": "system",

            "content": "You are a helpful writing assistant"},

            {"role": "user",

            "content": "Write me a poem about flowers"}

        ],

        "model": "gpt-4o"

    }