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:       Are you being served , madam ?  
 Person2:No . Um , do you carry any padded coat ?  
 Person1:        Yes , what size is in your mind ?  
 Person2:Small size .  
 Person1:        Any particular brand ?  
 Person2:Whatever . You know , I ’ m thinking of a gift for my mother . It ’ s her 60 birthday next Friday . Could you give me some advice ? You are the expert .  
 Person1:        How about this one ? It ’ s the latest design , simple but elegant .  
 Person2:Looks nice . How much do you charge ?  
 Person1:        $ 100 .  
 Person2:That ’ s sheer robbery . I ’ m sure you can do better than that .  
 Person1:        How much would you say ?  
 Person2:$ 80 . 

formal