personal assistant
US /ˌpɝː.sən.əl əˈsɪs.tənt/
UK /ˌpɝː.sən.əl əˈsɪs.tənt/

1.
a person employed to assist a boss or manager with secretarial and administrative tasks
:
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My personal assistant handles all my appointments and travel arrangements.
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She started her career as a personal assistant and quickly moved up the ranks.