I know it bit late response, but there is a responsive plugin is available. it's not a theme, just a simple plugin make it mobile responsive the user, agent, and admin area responsive, just need you to upload to the plugin folder and then activate it to make your ticket responsive for mobile. It is called ost_responsive_v1.8.zip available at https://devmansur.me.
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fre2mansur
@fre2mansur