Not necessary, but definitely recommended if you aren't the patient type.
Don't call to ask because you'll get out on hold. Have up after 7 minutes and went elsewhere
No but, it's safer for a reservation to guarantee a table.
No but it is recommended
Reservations are suggested. If you don't have one you can have a wait. Sometimes you can just set at the bar for just a couple but even that is not always an option.
To be on the safe side, I would definitely get a reservation.
No you do not need reservations sometimes you have to wait for a table to open up. But it's never been more than 10 mins
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