docs: def find_user(cls, session, mailbox, user):
          """Return conversations for a specific user in a mailbox.
  
          Args:
              session (requests.sessions.Session): Authenticated session.
              mailbox (helpscout.models.Mailbox): Mailbox to search.
              user (helpscout.models.User): User to search for.
  
          Returns:
              RequestPaginator(output_type=helpscout.models.Conversation):
                  Conversations iterator.
          """
          return cls(
              '/mailboxes/%d/users/%s/conversations.json' % (
                  mailbox.id, user.id,
              ),
              session=session,
          )