I have a trip in F next month with an EY flight that was pushed back by a day, I would like to keep the change as pending until LH F space clears up and I can change my reservation while avoiding repricing. Current EY ticket status shows TK (timechange, confirmed), am I risking anything by not acknowledging the change or am I guaranteed to be on the new flight? (I assume the latter but I want to make sure I don't lose my seat on EY F).

Thanks in advance!