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:       Guess who I saw yesterday ?  
 Person2:I don't know . Who ?  
 Person1:        Avril Lavigen !  
 Person2:the Canadian rock singer ? But I heard you had a part-time job yesterday . How did you see her ?  
 Person1:        yeah , I worked as temporary staff in her concert . Look , her poster , a CD ...  
 Person2:so you're a big fan , eh ?  
 Person1:        not really . But I like some of her songs . She's actually very talented . She's a song writer and fashion and fashion designer , too .  
 Person2:and she was in a movie once again , right ?  
 Person1:        yes , though I don't think her acting skills are that great .  
 Person2:what was your impression of her when you saw her in person ?  
 Person1:        she looked sweeter than her pictures .  
 Person2:did you take a photo with her ?  
 Person1:        no , there were too many people . When she got out of the car , her fans were all screaming , trying to give her flowers and ger her autographs .  
 Person2:crazy ! 

informal