Dick let Barbara change the subject; there was plenty of time for him to warn her about anyone that could potentially be a threat. Besides, he had absolutely no intention of letting her get hurt. If there was really any danger to her life, then Nightwing would definitely be there to protect her. If she wasn't able to do it herself, of course.
"Most of these places have people working in them," he told her with a nod to one of the cafes with a waiter or two milling around inside. "But they're the same as everyone else around here, no useful information whatsoever. Except the soup of the day."