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:       Can I help you , Madam ?  
 Person2:Yes . I'd like to buy a sweater for my husband . Which style is the latest ?  
 Person1:        These are all the latest fashion . How do you like this white turtleneck one ?  
 Person2:I like this style . But do you have any other colors ? I feel that this color doesn't suit his complexion .  
 Person1:        We also have it in grey .  
 Person2:Great ! I will take it . And could you suggest a pair of trousers to match this sweater ?  
 Person1:        It's my pleasure . I think this pair of jeans will suit the sweater well .  
 Person2:Let me see . Yes , they are perfectly matched ! 

informal