Well, I find that it is much less embarrassing for me to find out the person's name than to keep up the farce. a technique I use is at the end of the discussion say, "Thank you, excuse me, what is your name again?" Trust me, they most likely don't know your name either and will perhaps appreciate the refresher.
Plus, it will be a good character exercise to conquer something that makes you uncomfortable. Be afraid and do it anyway.
Best wishes,
AMW