I happen to work in the area and here are few that are good and close by the BMO Centre:
Vagabond Calgary, 1129 Olympic Way SE, Calgary, AB T2G 0L4, Canada
Grumans Catering and Delicatessen, 230 11 Avenue Southeast, Calgary, AB T2G 0X8
Lotus Vietnamese Noodle House, 1032 Macleod Trail Southeast...