He got a smack on the head for his efforts -- though Ran always made sure to hold back enough to not seriously hurt 'Conan'. "They're here somewhere! Maybe they're all sleeping."

Not particularly believable, but more reassuring then 'Maybe they're all off dealing with 1412 because he went on a rampage'.

...Or maybe there'd been a murder. Considering who was occupying the hotel, that could easily gather together well over half the local population.