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'.
Input:  Person1:       Hello ! Can I help you ?  
 Person2:Well , I am looking for some winter clothes for my fiancee .  
 Person1:        Oh , it's the high time for you purchasing in our clothes shop . We are now having a preseason sale on all our winter apparel .  
 Person2:Really ? What's that ?  
 Person1:        Every thing for winter is 20 % off .  
 Person2:I think my fiancee may favor the sweater in the shop window . Would you like to help me look for any skirts that go with this sweater ?  
 Person1:        Sure , we have both skirts and trousers that would look well with the sweater . Look at this section .  
 Person2:I especially like this flowery skirts . My fiancee will look very elegant in this .  
 Person1:        You have a good taste . It's very much in style this year .  
 Person2:I don't think the green one fits her complexion . Do you have any skirts in light color or tan ?  
 Person1:        Look on the rack to the right .  
 Person2:Oh , yes . I'll take this one . Can I pay by traveler ’ s check ?  
 Person1:        It's ok . 

informal