input: Write a function to find two numbers in a list that add up to a given sum.
  assert twoNumberSum([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 8) == [5, 3]
  assert twoNumberSum([10, 20, 30, 40, 50], 70) == [50, 20]
  assert twoNumberSum([5, 7, 1, 2, 8, 4, 3], 10) == [8, 2]
output: def twoNumberSum(numbers, target):
      seen = set()
      for num in numbers:
          potential_match = target - num
          if potential_match in seen:
              return [num, potential_match]
          seen.add(num)
      return []