Illuminating the Dream Realm

Only a fragment:

Exiting a rollercoaster at a crowded theme park. A girl with an annoying voice was complaining about how she didn't understand the ride. Someone who looked a lot like one of my college professors offered to give a tour of the rollercoaster. I saw my sister and cousin, and waved to them to join. The tour guide said there was no room for them, so I got angry and we walked away. He looked sad. :P