At the beginning of Plato’s dialogue Protagoras, we find Socrates
saying the following:
But I see that you are
disinclined, and as I have an engagement which will prevent my staying to
hear you at greater length (for I have to be in another place), I will
depart; although I should have liked to have heard you.
Thus I spoke, and was rising from my seat, when Callias seized me by the
right hand, and in his left hand caught hold of this old cloak of mine. He
said: We cannot let you go, Socrates, for if you leave us there will be an
end of our discussions: I must therefore beg you to remain, as there is
nothing in the world that I should like better than to hear you and
Protagoras discourse. Do not deny the company this pleasure.
The dialogue concludes with these remarks, also from Socrates:
By all means, I said, if that is your wish; for I too ought long since to
have kept the engagement of which I spoke before, and only tarried because
I could not refuse the request of the noble Callias. So the conversation
ended, and we went our way.
The excuse “I can’t stay because I have an
appointment.” is at least as old as Plato.
Quotations are taken from the translation by Benjamin Jowett as
published by Project
Gutenberg.