In Sea of Thieves, your bread and butter for making gold and increasing reputation with the guilds is by completing voyages.
Once you sign up for a voyage however, the game doesn’t make it very easy to get rid of the voyage if you change your mind, chose the wrong one, or acquire higher tier voyages and want to clear out space for them. Since you can only hold three voyages at a time, this can quickly become problematic.
The only way to cancel a voyage (at the time of writing this article) is to first accept the voyage on the table in your ship, and then vote to cancel it.
This isn’t super painful in solo or duo games, but if you’re on a Galleon full of randoms, it might start to get tough.
Hopefully Rare addresses this in the future. I don’t see a reason why they wouldn’t. I imagine there will be an option on the voyages page in the future to cancel them.