Hi Naman,
1. Get the version Id from the error message
2. Login to Workbench
3. Go to Utilities > REST Explorer >> Perform a GET
4. Add the following to the URI field and change the Id with the FlowId you are investigating /services/data/v36.0/tooling/sobjects/flow/30124000000PcNDAA0
[NOTE: v36.0 refers to the API version and as new tooling API features are released, version may need changing]
5. Click Execute
6. Open the ‘attributes’ folder
7. Check the ‘ProcessType’, if the value is ‘Flow’ then this is a normal flow, if the value is ‘Workflow’, this is a Process. Here you can also see the MasterLabel, which should provide you with the name of the flow/process.
Thanks