Sienna of where - Man Elite?
I've only tried to book a girl twice at Man Elite and both times their receptionist had a pretty shit attitude and bedside manner, so I didn't touch them again. This was about 2 years ago.
We are going slightly off topic, but yes it was Sienna from Man Elite. I've booked a few times with them and ironically all was well until I met with Sienna.
In my experience one of their receptionist can be quite " aggresive ", the other one is quite nice
To clarify, and to avoid people ranting, confused Sienna for Sophie.

Have not met Sophie, sorry OP