Robert mistakenly gave Sun and Jin their hotel room key, but Jin explained that they were not married and that he should be in a separate room. The clerk apologized, and then gave Jin another room. ("The Package")
The casting call described him as "[DESK CLERK]. Male.. 30s, any ethnicity. Loves his job and is usually on top of things. When he’s made a mistake, he’s quick to accept it and resolve it satisfactorily. CO-STAR."