Also, at first, they don't say anything. Then the second one says like one word. Or maybe it just sighs...anyway, they don't get too chatty until the 5th or 6th one, so I think you are doing just fine.
You can also join this group and keep your eyes peeled for the next ghost tour! :) Guided tour around the world to all 40 locations where the ghosts are known to appear.
I did the ghost tour and it was a blast, takes about 2 hrs but met lots of people and had fun and at the end had my 7 ghosts; even managed to complete a couple of quests that require a bunch of people to help complete ;)