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

[38, 40, 43, 11, 37, 42, 33, 2, 14, 36, 49, 26, 7, 19, 32, 45, 10, 39, 29, 20], target=90
[]

[33, 20, 3, 10, 11, 28, 44, 26, 6, 31, 40, 46, 15, 47, 8, 48, 34, 30, 4, 29], target=27
[]

[1, 40, 29, 10, 12, 21, 47, 28, 49, 38, 13, 26, 42, 25, 15, 11, 44, 4, 43, 23], target=16

[1, 15]