Booking a flight is the kind of thing I'd really want to avoid doing myself nowadays if possible though. Surveying the offers is usually such a snake pit of deceptive marketing and incomplete service conditions that I feel somewhat nauseous just at the prospect of having to look at it.
I wouldn't remotely trust a software assistant to deal with all that misdirection autonomously, but I guess I'd be prepared to give it a chance collating options with tolerable time and cost, attempting to make the price include the stuff that has to be added to preserve health, sanity and a modicum of human dignity.
Nearly everything targeting consumers is a snake pit now.
Everything has one or more upsells. Dark patterns are now nominal practice. Quality has gone to shit.
Asking it to find the best deal? Sure, I could totally see that. But I want to double check that myself and actually buy it in order to make sure my flight to Denver from Portland doesn't have a layover in Anchorage or something.