What did colleagues miss when commenting on you? How to reply?

What did colleagues miss when commenting on you? How to reply?

It's a pity that you can answer that. You didn't tell us. What a great opportunity! What a pity to waste it like this. Next time there is such a situation, you must tell us in advance, so that we can get ready, so that we can have another chance if we miss it again, otherwise we will be really unhappy and too busy to pay attention.