TASK DEFINITION: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
PROBLEM:  Person1:       My computer isn ’ t running at the same speed it used to be , it is testing my patience everyday . Can you tell me how to make it run faster ?  
 Person2:If you want to speed up your system , you ’ Ve got to clean it up first .  
 Person1:        How ?  
 Person2:You need to free your disk space . The simplest way is to use a Disk-Cleanup tool to remove temporary files and in store programs that you no longer use . Things should be fine next time you start . You also need to control what starts up . There is a program calls Start-up Delayer , It can help to set after how much time programs should be loaded after Windows boosts . For example , you can choose to set your Fox Mail program to load 30 seconds after Windows starts up .  
 Person1:        Very useful advice , I will try them right now . 

SOLUTION: formal

PROBLEM:  Person1:       My god , it's such a lovely lake ! The lake has a water surface of 56 square kilometers .  
 Person2:No wonder it looks so huge .  
 Person1:        We are now walking on what is in fact an island . Here we get one of the 10 sceneries of the West Lake , Autumn Moon over the Calm Lake .  
 Person2:Why is it called Autumn Moon over the Calm Lake ?  
 Person1:        It's so named because in the pavilion over there the great poet Bai Buyi of the Tang Dynasty would take a rest after drinking a little too much , and watch the moon over the lake .  
 Person2:Very romantic .  
 Person1:        Now let's board the boat and have a ride on the lake .  
 Person2:Sure ( They get on the boat ) .  
 Person1:        Wang , what's that building over there ? It looks like some sort of a huge pavilion .  
 Person2:You are right . That's the Heart of Lake Pavilion , situated on an islet.It was built in 1552 and is the largest pavilion on the West Lake . Oh , here we are at the Little Yingzhou island . Let's get off the boat . Please watch your steps . 

SOLUTION: informal

PROBLEM:  Person1:       Shall we buy ?  
 Person2:It really depends on you .  
 Person1:        But if you were me ?  
 Person2:If I were you , I'd buy . 

SOLUTION:
formal

