Help ! Creating Card Game , Create new (table) room in Unity

i'm creating multiplayer card game. i want make a private table (room) , but when i'm connecting to server it all connect to same room.

my code:

public string serverName = "localhost";
public string port = "3553";
public string roomName = "chat";

public IEnumerator Start()
{
String uri = "ws://" + serverName + ":" + port;
Debug.Log(uri);
client = new Client(uri);

    client.OnOpen += OnOpenHandler;
    client.OnClose += (object sender, EventArgs e) => Debug.Log("CONNECTION CLOSED");

    Debug.Log("Let's connect the client!");
    yield return StartCoroutine(client.Connect());
    room = client.Join(roomName);
}

public void Join()//button event
{
    StartCoroutine(ConnectToRoom(rname.text));
    rname.text = "";
}

public void Create()//button event
{
    StartCoroutine(ConnectToRoom(rname.text));
    rname.text = "";
}

IEnumerator ConnectToRoom(String Room_Name)
{
    Debug.Log("Let's join the room!");

    //if Client Dose not Set room name;
    if (Room_Name.Equals(""))
    {
        Room_Name = "NO ROOM NAME";
    }

    //Client Connect to Existing room
    if (!isExistingRoom)
    {
        room = client.Join(roomName, new Dictionary<string, object>()
        {
            { "create", true },
            { "name", Room_Name }
        });
    }
    else
    {
        room = client.Join(Room_Name);
        isExistingRoom = false;
    }

    room.OnReadyToConnect += (sender, e) =>
    {
        Debug.Log("Ready to connect to room!");
        StartCoroutine(room.Connect());
    };
    room.OnJoin += OnRoomJoined;
    room.OnStateChange += OnStateChangeHandler;

    room.Listen("players/:id", this.OnPlayerChange);//players array
    room.Listen("players/:id/:axis", this.OnPlayerMove);//x and y coridinates
    room.Listen("messages/:number", this.OnMessageAdded);//message array
    room.Listen(this.OnChangeFallback);

    room.OnMessage += OnMessage;

    while (true)
    {
        client.Recv();
        yield return 0;
    }
}