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:       Where is John ? I can't find him anywhere .  
 Person2:Haven't you heard that he is in prison ?  
 Person1:        What ? Beg your pardon .  
 Person2:John is in prison now . He was copped outstealing .  
 Person1:        I just cann't believe my ears ! 

informal