How can you be sure that there is an actual person at the other end of the chat line?

       What or who is supposed to be at the other end of the chat line? I think only people are capable of actaully typing and compehending what you are saying. Actaully when i think about it, it is possible for a spam bot to also be messaging you. But chat websites usually require a comfirmation code type thing to determine if the user is a spam bot. Usually spam bots are not capable of typing in the correct code; hence, the chat website does not allow spam bots.