depends, if he/she is a loved one who shares the same thoughts as me- i'd tell her that if she can manage, to send me a message thru my dreams or whatever on what exists on the other side and if what we believe in is true. that wouldn't be insensitive on my part since i'd do the same favor for him/her.
if he/she is a theist
--if he/she is nice to me- i'd tell him/her what he/she wants to hear.
----be sweet, nice and reassuring.
--if he/she was a pain in the neck and trying to convert me
----hahaha, i wouldn't really know what i'd say.
------i just might say, you'd better be right with what you believe in
------because i if you find out that i'm right,
------i won't be there to help you