People shop ahead of the holy month of Ramadan at the Mall of the Emirates in Dubai, United Arab Emirates, March 22, 2023. REUTERS RIYADH/DUBAI, April 13 - Sales at Europe's biggest luxury brands have fallen sharply in Dubai and Abu Dhabi as the Iran conflict disrupted what had been one of the industry's fastest-growing markets, in the latest setback for the $400 billion global luxury sector. Sales at the Mall of the Emirates in Dubai fell 30% to 50% in March from a year earl