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: [25, 1, 39, 40, 29, 49, 22, 43, 42, 38, 48, 2, 46, 15, 16, 12, 34, 3, 27, 30], target=55
A: 
[40, 15]