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:       Are you excited about your trip next month ?  
 Person2:Yes and no . I can ' t wait to go to Europe , but at the same time I am terrified .  
 Person1:        Why ?  
 Person2:Well , I have acrophobia . I have a chronic fear of flying .  
 Person1:        Oh really ? I have an uncle who is also terrified of flying . It ' s not that bad though , I mean , it is pretty scary to be in this big machine flying through the air at seven hundred miles per hour . I actually have arachnophobia .  
 Person2:You ' re scared of spiders ? I actually have two more phobias . Acrophobia and glossophobia .  
 Person1:        I guess that explains why you are afraid of flying , but public speaking is not that bad .  
 Person2:Are you kidding ? When I get on stage , my palms start to sweat , I get really nervous and I can hardly speak .  
 Person1:        Well , I must confess I am a bit claustrophobic . I hate being in an elevator for more than 5 seconds .  
 Person2:We are such weirdos right ? 

informal