unreserve
/ˈənˌrɛzəv/Definitions
1. verb
to cancel a reservation or engagement
“She had to unreserve the table as her guests arrived early.”
2. noun
the act of canceling a reservation or engagement
“The unreserve was made due to unforeseen circumstances.”
3. noun
a place set aside for a particular use or activity
“The unreserve was necessary for the emergency vehicles to pass through.”