answer: #Person1# asks Miao Li to help send the registered letter on Miao's way to the store. Miao agrees.
documents: #Person1#: Hello, Miao Li, Where are you going?
  #Person2#: Hello, I am going to the store to buy some fruit.
  #Person1#: Oh, Would you do me a favor?
  #Person2#: Yes?
  #Person1#: Please mail this letter for me on your way to the store.
  #Person2#: Sure. Do you want it to be registered?
  #Person1#: Yes, I think so. There are some pictures in it. It would be a great pity if they were lost.
  #Person2#: Yes, I will be glad to mail your letter.
  #Person1#: Thanks.
  #Person2#: you are welcome.