how to find ids which don't match with lookup

[rimi_splunk]

I'm a  newbie on splunk, trying the basic thing but didn't find any solution. Reaching out if I get the direction/solution.

I have the search results with userid using the query. Lookup file(master_users) has all users with column name userid.  I want tonly those userids which are in lookup but not in my search result. 

Tried multiple options but didn't find the right solution. 

[ITWhisperer]

Assuming your lookup has another field other than userid which is not in your first search e.g. role, then you do lookup with userid and add where isnotnull(role)