reservation

He has a hotel reservation, he can have a good rest at the hotel tonight.

we don't have a reservation at this restaurant, there is no more place now.

can I make a reservation?/I woould like to make a reservation.
what time are you coming?/what day are you coming?/when will you be coming?/what time are you arriving?

I'm coming on +date/time/week

How long will you be staying?--I will be staying on 3 nights.