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 , BOB ?  
 Person2:I think it ’ s my ankle .  
 Person1:        What happened ?  
 Person2:One of my snow-shoes that cause on rocks .  
 Person1:        Can you stand ?  
 Person2:I don ’ t think so . It ’ s kind of sore .  
 Person1:        what I have to give you a hospital for an ex-treat .  
 Person2:It ’ s that really necessary ?  
 Person1:        It maybe worse than it seems . 

formal