Normally, in this situation, Beka would just pretend she was on duty, grip at her club and stand a bit taller in her uniform. This new... attire, didn't really allow for that. And, of course this stranger is being overly nice. The terms 'doctor' and 'science' might have gone over her head, however, Chief and Officer rang clear in her ears.

"Guard-". She swallowed, and tried again. "Guardswoman Rebbecca Cooper, Sir."

The question would come in a minute, when she could actually talk.