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:       What's the matter with my wife ?  
 Person2:She had a sudden heart attack .  
 Person1:        I guess so . It was very terrible when she was at the onset of the illness . I am worried that I would lose her .  
 Person2:Don ’ t worry . She is much better now . But you are not permitted to disturb her at the moment .  
 Person1:        I know . But is she out of danger now ?  
 Person2:Yes , I think so .  
 Person1:        Thank you very much , Doctor .  
 Person2:My pleasure . 

informal