Can we make reservation for tang dance show and dinner in Xian online?

Yes, you can. I found their official wesite with both Chinese and English version by chance by inputting "tangdynasty". You can also have a try. Good luck~

Can't find reservation for Tang Dynasty Dinner and Show!

Sorry, but you have sent me a link, but there is nothing about reservation for dinner and show!
Please send me address for reservation! We want the dinner with western and chinese style, not the dumplings!

Regards Lotta
lotta.herlitzhotmail.com

Here is their contact info:
0086-29-87822222
contactxiantangdynasty.com

You can make a reservation directly via them.

Hi. The best website to book ticket is TangDynastyShow.

The service is excellent and I had a very good experience with them. Please note that the show is extremely popular, so booking tickets well in advance is highly recommended. Hope this helps.