Adding a field to a Room Booking form


I’ve been trying to add a field to a room booking form through a plugin. From what I understand from this plugin (, I need to extend a form from the room booking module and then carry out the things needed within it.

Is my understanding wrong? If so, could you please point me towards the right direction? I’ve been having a tough time trying to wrap my head around it. I would really appreciate it.

If you want to extend/modify room booking from a plugin, you might want to have a look at this plugin instad: