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 your number ?  
 Person2:I'm number seven . What about you ?  
 Person1:        Five .  
 Person2:Hah hah ! You have to go before me .  
 Person1:        You think it's funny . I'm terrified .  
 Person2:Don't worry . It's safe .  
 Person1:        But I've never jumped off anything in my life . The highest thing I've jumped off is my bed . I'm scared .  
 Person2:You are the one who wanted to come here , Sandy . You should enjoy it .  
 Person1:        I guess I'm adventuresome , but then I'm scared too .  
 Person2:I'm not too scared . But I've done sky diving before . 

informal