I got the following feedback from Google team:
The query pattern for the initialTrigger you provided “$SchemaOrg_Place:geo-city” is intended for discovery and is too broad for you Action.
I am not sure what this means and how can I correct this so that my action is approved. I am using API.AI platform. My action captures a City Name as a request parameter. I have defined an entity parameter name is geo-city and Entity type is @sys.geo-city.