I live in the Boston area, but I travel to NYC to see friends about once a month. Last time I was there (January 28-February 3) I approached a couple attractive girls, got their numbers, and got to know them a bit. My issue is that I can't see them in person until mid-March, and I'd like to both continue talking to them, and possibly interest them further between now and the next time I can see them. What would be some things I could say or do that would help with that?