DCP1 - Finding pair of numbers with specific sum

function findNumbersForSum(arr, k){
    let flag = false;
    for(let i=0; i<arr.length-1; i++){
        for(let j=i+1; j<arr.length; j++){
            if(arr[i] + arr[j] == k){
                flag = true;
                return [arr[i], arr[j]];
            }
        }
    }
    if(flag === false){
        return ("There is no pair of 2 numbers that have sum = " + k)
    }
}

// MAIN FUNCTION
arr = [1,2,3,4,5,6]
k = 7
console.log("arr = " + arr);
console.log("k = " + k);
console.log("The two numbers I care about are: " + findNumbersForSum(arr,k));