Ah, sure, of course, the Manhattan is indeed best with sweet vermouth.  But you’ll also want to use a half-ounce of sweet vermouth (one tablespoon) with two ounces of whiskey.
assitant
Dry vermouths are more common in Manhattan cocktails, so I’d suggest sticking with that.
assistant
Hi, I'm in the mood for a Manhattan. Can you give me a recipe for mixing one?
user
Of course, here’s what I suggest: A cocktail glass half filled with whiskey, one tablespoon of dry vermouth, a twist of lemon peel.  An Angostura bitters drop, and one cocktail cherry.
assistant
Dry vermouth? Are there other types of vermouth I might use instead?
user
Absolutely, the two main styles of vermouth are sweet (e.g. Cinzano, Dolin Rouge, Noilly Prat), and dry (e.g. Martini, Carpano, Punt E Mes).
assistant
Are you sure sweet vermouth wouldn't be more appropriate for a Manhattan? I seem to remember them being pretty sweet.
user