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:       How are you , Sue ?  
 Person2:Pretty good . I ’ Ve just had my new poems published .  
 Person1:        Congratulations on your success .  
 Person2:Thank you .  
 Person1:        And how ’ s your brother ?  
 Person2:He is fine .  
 Person1:        He ’ s going to be sent to Britain to study , really ?  
 Person2:Yes . He ’ s already got the passport and visa .  
 Person1:        Fantastic ! Please send him my congratulations .  
 Person2:Thank you . He ’ s very lucky indeed . 

informal