chat_history: ["I'm going to see my parents in 3 weeks!! I didn't see them since 2014! I'm so excited", "that's great! I bet they are equally excited if not more :) are you travelling alone?", "no, with my little baby. they've never met my son, they can't wait"]
sys_response: oh i bet! you guys will have such a wonderful time together
situation: i'm going to see my parents in 3 weeks!!!