To the person I will never see again:

Though this was a could have been,

it will never be a would have been.

To the person I will never see again:

Words were exchanged but will quickly be forgotten.

(Perhaps there shouldn't have been any exchanged at all.)

To the person I will never see again:

You may have already forgotten me but I have not.

I will remember you until I'm distracted by another person I will never see again.

To the person I will never see again:

Thank you for making mundanity interesting for a moment.

To the person I will never see again:

Goodbye.