OB is totally correct.

Very rarely are you going to find a quality girl who is just available last minute at that hour to trek to dtla.

Most of us don't even pick up because of the late night crazy BS. We like to look our best for you. I know I'mnot dricing anywhere without a screening or deposit...too many time wasters.  

The Pet Peeve of most of us girls is the phone or text "R U available [now]?" like its 30 min Dominos as one of the other commenting ladies mentioned.

Your best bet if you insist on not preplanning [because you love being "spontaneous"] is  going to be a touring girl because she may be waiting around at herincall in "work mode".  

Once I did a late night last minute appt at the Chateau Marmont in Hollywood l but the client lucked out because I was already out in the area for an outcall. That is still  an expectation for most independent ladies. 9/10 If we do late night or last minute at that hour, its a client we know already,not a new one.....Vegas is a little different...