chat_history: ["I'm really excited for this next weekend!", "What's happening this weekend? I hope you have some good things planned.", 'A friend that has been living overseas for the last year or so is going to come back to visit finally!']
sys_response: That's awesome! I'm very excited for you this is a good event for you!
situation: My friend who has been living overseas for the last year has finally came back. It's been a great time.