chat_history: ["I once left all cash and didn't have any to pay for a metro ride, some random girl paid for me without saying a word.", 'Wow!  How kind is that!  Their really are kind people left in this world.  How did you respond?', 'Yes, and I am thankful for those kind of people.']
sys_response: *There* oops.  Did you ever find out her name?  Or find out a way to thank her?
situation: I remember one time I didn't bring any cash to pay for a metro ride, and some girl just paid for me not asking anything in return.