unable to find list of matches created on unity relay server

I am a UNET beginner . I am customizing network manager HUD to achieve following functionality

 if( matches.Count == 0 )
 {
           //create a new match
           //and wait for someone to join
 } else
 {
           //join the first match in matches list
 }

i am trying to achieve this functionality in this way but every time this code creates a new match and can not find already created match -thanks in advance please help if any one knows - -findmatch is triggered by a button at start

 public class NetworkCtrl : NetworkManager
 {
     public void Start()
     {
 
         StartMatchMaker();
         
     }
     
     public void findMatch()
     {
         matchMaker.ListMatches(0, 20, "**", true, 0, 0, OnMatchList);
     }
     
     public override void OnMatchList(bool success, string extendedInfo, List<MatchInfoSnapshot> matchList)
     {
         base.OnMatchList(success, extendedInfo, matchList);
 
         if (success)
         {
             if (matches.Count != 0)
             {   // some  one already created a match so join that match
                 joinMatch(matches[0].networkId);
                 label.text = "joining found matches";
             }
             else
             {
                 // no match exists so create a match and wait for someone to join
                 createMatch();
                 label.text = "creating new match";
             }
         }
         
     }
    public void createMatch()
     {
         matchMaker.CreateMatch("", 2, true, "", "", "", 0, 0, OnMatchCreate);
        
     }
    public void joinMatch(NetworkID netId)
     {
 
         matchMaker.JoinMatch(netId, "", "", "", 0, 0, OnMatchJoined);
     }
 }