It’s not as if you hoping to “chat” with someone and end it there.
You want to talk with them and if things go well meet them.
A grown woman (or man if the lady is asking) can decide in a few weeks if she would like to meet you – someone looking for a pen pal should do so somewhere else.
Your time is valuable and should be used to communicate with people truly interested in meeting you.
I never went for phone conversations as a stepping stone from internet communication to meeting.