How to create a room as server as a host when a client is unable to join any room

Is it possible in free plan of bolt with 20 CCU to create a room when a client(player) searches to join a random room and if none is found the server will create one as itself as host?
Actually I am new to photon bolt, please help me if it is possible..
And with that, is it possible to control the scripts on the server for each room?
Thank You