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:       Look , my clothes are wet .  
 Person2:Mine are wet , too .  
 Person1:        Unexpectedly , a girl threw a bucket of water on me .  
 Person2:She wished good luck to you .  
 Person1:        The Dai people are enthusiastic .  
 Person2:Yes . 

informal