Change my job duties on my first day of work ,made me frustrated - Airport Service Agent The Emirates Group Employee Review

I am employed as a airport services agent in hk. On my first day of work ,the manager transfer me to work in lounge as a lounge agent ,actually I have no any lounge experience before, btw I accepted. However I feel very frustrated when I am working in lounge because the job contents of lounge agent and airport agent are totally different, I expressed to my senior officer ,they said to me that " you have no choice !"