CZ360 connect to CZ343

My nephew and family comes to attend a function here in Melbourne from Delhi, they had to take a flight from Delhi on 24/05/16 by CZ360 but the flight was cancelled and they told they will be send by next one, still now i not have any information about them, if you want i will give their names, all set up for function today only waiting them.can you help me please and tell their status.
Thanks
Birinder Singh