Don't have that second form yet, but I was in the sewers. Still, I can only find the hint guy you mentioned. I can't find the missing person where they seem to work, nor in the outer areas. I don't know where to look any further.
Okay I see. Then let me help. You need to use that from to pass through the fences behind the back of the guild at night. There should be one lonely guild worker there. The area in the easter part of town with the shrine and shops. Hope that helps.
