What If: a romantic comedy with a somewhat run-of-the-mill story, Michael Dowse’s film is nevertheless made more interesting and pleasurable by the smart dialogue (if at times a little bit too calculated to be cute) and charming pair of characters. Zoe Kazan and Daniel Radcliffe (despite his stardom) have a common-people quality to them; he is awkward, but the role calls for it. The occasional slapstick is out-of-place.