Do they prefer, or are they looking for, a red or a white?
Do they want a wine from a selected country?
If they are looking for a white wine, do they prefer or want a sweet or dry one?
If they are after a red wine, do they want a full- or light-bodied one?
Do they have a preference for a particular grape variety, growing region, or winery?
How much do they wish to spend?
What is the wine to be consumed with?