I REFER to the letter headlined, ''Deserving better system'', from Robert Armistead (South China Morning Post, June 23). It is the URBTIX policy to allow customers a free choice of seats subject to availability. Each of the 19 URBTIX outlets is provided with a booklet containing seating plans of all performing venues served by URBTIX. All box office operators are instructed to show the relevant seating plans to customers upon request at the counter. The Sha Tin Town Hall management, which is under the auspices of the Regional Services Department and an URBTIX ticketing agent, wishes to apologise to Mr Armistead, and promise that improvements would be made immediately to both the service standard andthe lighting of the public area in front of the box office. To further improve the URBTIX system, the possibility of acquiring a computer software package is being explored. This package may be able to display seating plans of all venues, including the large seating plan of the Hongkong Coliseum which will require 25 frames to display its 12,500 capacity. As regards funding, URBTIX is currently administered and funded by the Urban Council. Assessing the cost-effectiveness of URBTIX is an on-going exercise. We hope that the unfortunate incident at the Sha Tin Town Hall will not discourage your reader from booking tickets through the URBTIX system.