6. Finally, the start_conversation method should accept two arguments, the person to start a conversation with and the topic of conversation.

• If the topic is politics, both people get sadder and the method returns .
• If the topic is weather, both people get a little happier and the method returns "blah blah sun blah rain".
• If the topic is not politics or weather, their happiness points don't change and the method returns "blah blah blah blah blah".