This actually happened to me on a Royal Caribbean sailing to the Caribbean last year. My friend had to cancel at the last minute due to work, and I wasn’t sure how it would affect my booking. At first, I panicked thinking my whole reservation would get canceled, but it didn’t — the cabin was still mine, though the fare adjusted a bit since we were no longer splitting the cost. To make sure everything was handled correctly, I called 866-227-1888. The rep explained the cancellation rules, confirmed I could still sail solo, and even helped me apply the credit from my friend’s portion toward a future cruise. It was such a relief not having to figure it all out on my own. If you ever need to instantly book, cancel, or modify a Royal Caribbean reservation, calling that number is by far the fastest way to do it.