This system needs to take in more scheduling constraints like if I need to be somewhere for specific dates, but am free to travel before and after. I just book

This system needs to take in more scheduling constraints like if I need to be somewhere for specific dates, but am free to travel before and after. I just booked a multi-city international trip like this a couple days ago and did quite a bit of searching to get a conveniently timed, low cost, direct flights. I was somewhat flexible about which cities I visited also.