What should I say at the end of the meeting, assuming that I've never meet that person before?
Should it be something like:
"It was a pleasure to meet you."
"Nice to meet you."?
"Nice to meet you"
is more something you'd say just after the introduction, and isn't really suitable for the end.
"It was nice meeting you"
would be fine, but
"It was a pleasure to meet you"
after a meeting may be a better choice as it has a more positive connotation.