Most fullsize hair dryers for home use in Canada and the USA are 1600 Watts or more, with 1875 being a typical wattage (some are over 2000!) if you browse them somewhere like Target. Most won't be dual voltage, but most would usually be considered too bulky to travel with. None would meet the above requirement, not just the Dyson, unless it was dual voltage.
Travel-size hair dryers tend to be 1600 watts, but have a fair range (I've seen 1000-1600; e.g. Babyliss has two 1000 W foldable dual voltage travel models)) They are generally dual voltage, so they meet requirement that way. They tend to be smaller in size and a "folding" style which makes them feasible for travel.
Does a hair dryer of 450 watts or less even exist ??