answer: #Person1# wants to buy an mp4 player. #Person2# suggests buying a new cell phone because it has more functions and a larger flash memory and it's easy to carry. #Person1# thinks it's a good idea.
documents: #Person1#: my mp3 player is broken, so I want to change it for an mp4 player. Can you offer any advice about which brand and model to buy?
  #Person2#: an mp4 player? why don't you buy a new cell phone? You can find an mp4 player inside any of the latest cell phones.
  #Person1#: Oh, that's a good idea. Perhaps I should have a try.
  #Person2#: look at my cell phone. I can listen to music, watch movies, take pictures, play games, surf the web and download documents. It's just like a PAD.
  #Person1#: that's cool. I can use the computer and the internet pretty well, but I'm a little bit slow in the latest trends of digital products.
  #Person2#: that's Ok. you know, digital devices are becoming smaller and easier to carry, and they won't cost you too much.
  #Person1#: yeah, if I buy a cell phone like this, I don't have to take a music player everywhere I go, and I can save the cost of buying an extra mp4.
  #Person2#: that's right. what's the flash memory of your old mp3?
  #Person1#: 256MB.
  #Person2#: then any cell phone can meet your need because they generally have memories of over 512MB.