another improvement for chatbots

could you make it so there is a choice that allows a chatbot to know if a certain question has been said before and then have a default saying for it.

like for instance if I type the question I like pizza.the response would be I do not like pizza. if I type it again the default saying would be you already said that.

and if I type the question please sit down.the response would be I sit down.but if I type it again.the default response would be I am already sitting down.could this be done with think in the labels?and how would I do it?