One tap from dreaming to booking
Desire is perishable. The moment a guest feels it, the reserve button should already be under their thumb — not three screens away.

A guest is looking at the sea-view suite. The light is right, the price is fair, and for about four seconds they want it. Then they scroll to find how to book, hit a menu, land on a separate reservations page that reloads, pick dates again, and the four seconds are gone. So is the booking.
Desire has a half-life
The feeling that makes someone book is fragile and brief. It peaks at the exact moment they're looking at the thing they want — and it decays with every tap that doesn't move them closer to having it. Most hotel sites treat booking as a destination you navigate to. It should be an action available right there, the instant the wanting happens.
Count the taps on your own site between a guest falling for a room and confirming it. If it's more than a couple, you're losing people in the gap.

Put the action where the wanting is
This is why the reserve button belongs on the suite, not in the navigation. Pricing visible where the photo is. Dates pre-filled from the search they already did. A booking flow that lives inside the page instead of throwing them to a third-party widget that looks nothing like your brand.
The distance between wanting and having should be one tap, not a tour of your site map.
It matters more on mobile, where 70–80% of hospitality searches now happen — and where a clumsy reload or a fiddly date picker ends the session for good. The thumb is impatient. Design for it.

Every step you remove between dreaming and booking is a booking you keep. The best reserve button is the one a guest never had to go looking for.