The lobby has various functional areas, such as check-in/check-out reception, concierge, guest rest area, lobby bar, business center, guest bathroom, shop and so on.
—— The front office is divided into functional departments of the hotel, including housekeeping department, catering department and sales department. Its subordinate teams include front desk, concierge, telephone operator, assistant manager in the lobby, etc.
So strictly speaking, the lobby is geographically divided, and the front office is divided into administrative functions.
Generally speaking, the lobby is a part of the front hall.