Tickets for Z92 train Shanghai Xian on Aug 14th

I am looking for a help to buy hard sleeper tickets for 8 persons train Z92 train Shanghai - Xian departure 14 August 2011 at 19.10

The problem is, that we will arrive at Pudong airport at 10.10 a.m. and would like to pick-up tickets and leave Shanghai on the same day. I would like to pick up the tickets somewhere in Shanghai (travel office or hotel) on August 14. after 12.00
If you are able to help us, please let me know the price, how to transfer the money and how/where/when pick up the tickets

Regards
Piotr Betlejewski