This article explains the steps to find the service name of a database running on your local windows machine.
Open command prompt in your windows machine and issue below command, This should connect to your local database as SYSDBA
sqlplus / AS SYSDBA
Once you are connected to the database issue below command to see the service name of the database.
show parameter service\_name
Alternatively you can also open services in your windows machine and look for OracleSerrvice as show below