Bell captain- supervises bellhops (people who carry luggage etc)
Desk clerk- receptionist
Bellman receptionist- a bellman carries luggage and does errands (little jobs the guests want doing)
What difference does it make?- This can either mean what it says or can be a rhetorical question implying that something will not be very different or important.
Are you on the phone?- Do you have a phone?/ can you be contacted by phone?