Just to add a bit more on that, Kayak is an intermediary here, so it is reporting back from its partner travel bookers in return for a slice of the eventual pie. Some of their agents are fairly respectable, Expedia is one of them, some I'd be somewhat careful about, or at least book with a credit card backed by legislative consumer protection.

Some of the most intractable problems we see in this forum are from those who have booked with OTA and find themselves either with a changed booking (e.g. the airline has shuffled their flight times) or changed circumstances or a spelling mistake on their name. No one books a flight thinking "this could change", but the real world can creep in at the last moment. Very few of these OTA employ sufficient, or in some cases any, people who can fix problems expediently.

Proceed with knowledge and caution!