Originally Posted by
plunet
Not used Shenzhen personally but when asked to provide your name try
SMITH/JOHN
or
SMITH/JOHNMR
(adapt to your own name)
But the core problem here is that either the phone number or email registered against the booking is that of lastminute.com and if the airline is using any of those as some extra info or even for some kind of OTP then you're going to hit a brick wall.
All Chinese airlines require identity documents when booking. However, when the tickets are booked from non-Chinese OTAs, the documents were not processed, which is the reason why the ticket is not available.