Flight NZ126 Melbourne to Auckland Sunday 11 July at 6.55 was cancelled & there had been NO notification either by email or text message from Air NZ regarding said cancellation. We therefore had to change flights to Qantas & was consequently put on Jetstar flight JQ217. This flight was delayed & caused us stress on teaching our destination. We understand that there can be disruptions to flights due to Covid19, however expect a better communication with us .