when you meet your pen pal for the first time,

[peppy_man]

When you meet your pen pal for the first time, what do you say to him/her?
'Nice to see you'? 'How do you do?'? Or is there any other good expression for the situation? Thank you in advance.

[Casiopea]

What about? "It's nice to meet, finally, face to face."

[peppy_man]

Casiopea, thank you.
'Face to face' is the key in this case.
I shouldn't miss that.
'Finally' is also very important to express my feeling that
I have been waiting for the moment for a long time.
TNX a bunch.

[Casiopea]

You can move "finally" around, too:

It's finally nice to meet you.
Finally, it's nice to meet you.
It's nice to finally meet you.

Pay no mind to the split infinitive 'to finally meet'. It's a popular expression.