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'.

[Q]:  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 ? 
[A]: informal


[Q]:  Person1:       Good morning , Mary !  
 Person2:Good morning , John !  
 Person1:        I want to have a few friends over for a dinner party to celebrate my birthday . Would you be able to come the next weekend on Saturday ?  
 Person2:I'd be delighted to , John . Saturday did you say ?  
 Person1:        Yes , if that's all right for you .  
 Person2:I'm pretty sure I'll be all right . In fact , I'd be delighted to come over and celebrate your birthday with you . What time are you planning to start ?  
 Person1:        Oh , good . If you could come around six thirty or seven o'clock , that would give us some time to chat a whit over a glass of wine before dinner .  
 Person2:That sounds fine . I'll be there around seven . 
[A]: informal


[Q]:  Person1:       Time flies !  
 Person2:You're telling me . 
[A]:
informal


