I'm with Lut, HOW MUCH TIME DO YOU HAVE?!?!
I would definatelly start off by telling them how much I love them!!! Because I LOOOOVE THEM SO MUCH!!!!!! Then I would tell them how cute they are and I would tell them specifically the things they do that just make my day....(and that list would be endless) Then I would ask them how their purr box works, then I would ask them their favorite spots to be petted so I can pet them real good....... and it would go on and on and on....
ONE THING FOR SURE THOUGH IF THEY COULD TALK I WOULD BE IN TROUBLE CAUSE I WOULD GIVE THEM ANYTHING THEY WANTED!!!!!!!!!!!!!