Britain's Prince William and Catherine, Duchess of Cambridge visit a patient at Shaukat Khanum Memorial Cancer Hospital in Lahore, Pakistan October 17, 2019. Britain's Prince William and his wife Catherine, Duchess of Cambridge, played with children at a hospital in Lahore on Thursday (October 17) previously visited by William's mother Diana, Princess of Wales. Arthur Edwards/Pool via REUTERS

Britain's Prince William and Catherine, Duchess of Cambridge visit a 7-year-old Wafia Remain at the Shaukat Khanum Memorial Cancer Hospital in Lahore, Pakistan October 17, 2019. The Pakistani government hopes the couple's four-day official visit will boost the country's image as a tourist and business destination, after decades of sectarian violence and political unrest. Arthur Edwards/Pool via REUTERS

Britain's Prince William and Catherine, Duchess of Cambridge visit a patient at the Shaukat Khanum Memorial Cancer Hospital in Lahore, Pakistan October 17, 2019. William and Kate, who have frequently donned traditional Pakistani dress by local designers during their trip, have highlighted education and the impact of climate change in the country. Arthur Edwards/Pool via REUTERS

Britain's Prince William and Catherine, Duchess of Cambridge visit a 5-year-old Muhammed Sameer at the Shaukat Khanum Memorial Cancer Hospital in Lahore, Pakistan October 17, 2019. Arthur Edwards/Pool via REUTERS

Britain's Prince William and Catherine, Duchess of Cambridge visit a 5-year-old Muhammed Sameer at the Shaukat Khanum Memorial Cancer Hospital in Lahore, Pakistan October 17, 2019. Arthur Edwards/Pool via REUTERS

Britain's Prince William and Catherine, Duchess of Cambridge visit a 7-year-old Wafia Remain at the Shaukat Khanum Memorial Cancer Hospital in Lahore, Pakistan October 17, 2019. Arthur Edwards/Pool via REUTERS