We had to sign a form saying we will clear with dispatch before leaving assigned area. We have crr's who refuse to do this and head back to the station on their own terms. Hey, I know many of us have to get back to the station in a reasonable time to offload our Memphis stuff but from my experience dispatch usually "clears" within a minute after requesting one. Yes, I understand you might have to explain why you did'nt make that re-att but sometimes you have a good reason. Sometimes you just have to say "I didn't have time" clear and simple. I tell them you want me to make a re-att or do you want all my Memphis to miss the outbound schuttle, let them make the call.