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
Q: [31, 30, 16, 37, 34, 1, 17, 21, 15, 23, 38, 20, 5, 3, 48, 49, 6, 25, 36, 19], target=44
A: 
[21, 23]