answer: #Person1# suggests cycling to the concert to avoid traffic. #Person2# agrees and gets #Person2#'s helmet. #Person1# thinks a round helmet is better. #Person2#'s new bike has some problems, and #Person1# helps to fix it.
documents: #Person1#: are you ready to go the concert? 
  #Person2#: yes. Shoud we go there by bus so we aren't late? 
  #Person1#: actually, why don't we go there by bike? We could get stuck in traffic if we travel by bus in ruch hour. 
  #Person2#: that's true. Cycling is good for our environment, too. Let me just get my helmet then. 
  #Person1#: is your helmet comfortable? 
  #Person2#: not really, but I liked the design, so I got it. 
  #Person1#: maybe you shoud think about getting a round helmet; they're better. 
  #Person2#: I'll think about it. 
  #Person1#: is that your new bicycle? 
  #Person2#: yes, my father gave it to me for my birthday. Do you like it? 
  #Person1#: it's the newest 10 speed cycling mountain bike. These are really expensive! 
  #Person2#: nothing but the best from my dad. I like everything about it except for the brakes. They are a bit sticky. 
  #Person1#: I can fix those for you. Is there anything else wrong with it? 
  #Person2#: well, my saddle is too low for me. Do you know how to change the height? 
  #Person1#: that's easy. It's important to have the saddle high enough so that your legs can extend fully when you are on your bicycle. 
  #Person2#: is that why my knees have felt sore after every time I've ridden my bike? 
  #Person1#: it's possible. Give me a minute and I can fix these for you and then we can go.