def delete(app_id, user_to_delete, custom_headers:nil)
      response = delete_async(app_id, user_to_delete, custom_headers:custom_headers).value!
      response.body unless response.nil?
    end
def delete(app_id, user_to_delete, custom_headers:nil)
      response = delete_async(app_id, user_to_delete, custom_headers:custom_headers).value!
      response.body unless response.nil?
    end
Removes a user from the allowed list of users to access this LUIS
 application. Users are removed using their email address.

 @param app_id The application ID.
 @param user_to_delete [UserCollaborator] A model containing the user's email
 address.
 @param custom_headers [Hash{String => String}] A hash of custom headers that
 will be added to the HTTP request.

 @return [OperationStatus] operation results.