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:       Did you see May today ?  
 Person2:Yes , but why does she have such a long face ?  
 Person1:        I don't have the foggiest idea .  
 Person2:I thought she'd be happy .  
 Person1:        Yeah , especially since she got a promotion recently .  
 Person2:I don't know . Maybe it ’ s some kind of personal problem . 

formal