You are given a list of integers and an integer target, return a list of a pair of numbers in any order such that they add up to target. If there is no such pair of numbers, then return an empty list

[26, 3, 9, 6, 40, 30, 31, 12, 18, 45, 16, 23, 14, 1, 21, 44, 35, 19, 2, 43], target=77
[]