i always ask that question of myslef....what to say....someone once told me is that i should keep my slef busy , i dont mean workwise but busy in your other pursuits eg i have an interest in english soccer, so i would ask about that eg how are liverpool doing.....
one question that i think allows room for conversation is to ask somebody have they any holidays planned? you could both discuss that, i use this one alot with the people i meet.....i then tell them about my best and worst holiday destinations eg L.A. was great but barcelona was crap.....i then tell thme why......LA was interesting as i saw all the famous peoples houses, barcelona was crap as there was nothing good to see
anyway, what i want to say is i find it difficult to talk but i do have those two options....i think conversation about holidays is interesting for all....i always keep that one up my sleeve
also are you on facebook, that can give rise to conversation....one of my cousins told me that when they ever meet up with family, they would resort to facebook to get some tips for conversation