<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def verify_logout_request(cls, logout_request, ticket):
 """verifies the single logout request came from the CAS server returns True if the logout_request is valid, False otherwise """

        try:
            session_index = cls.get_saml_slos(logout_request)
            session_index = session_index[0].text
            if session_index == ticket:
                return True
            else:
                return False
        except (AttributeError, IndexError):
            return False