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 date is it today ?  
 Person2:Why ?  
 Person1:        Look at the girls in the street . They all have a bunch of flowers.Is it Valentine's Day ?  
 Person2:Oh , yes ! I completely forgot about it .  
 Person1:        Did you have a fight with Jack ?  
 Person2:No , but now he'll be in trouble . What's a boyfriend for ? To forget about Valentine's Day ?  
 Person1:        Come on , dear ! You forgot it , too .  
 Person2:You know , it's OK for a girl to forget these " big days " , but for a guy , to do that is unforgivable .  
 Person1:        Is that your phone ?  
 Person2:Oh , it's Jack . Excuse me .  
 Person1:        Wow ! Good timing .  
 Person2:He asked me out to a dinner tonight . How about joining us ?  
 Person1:        Come on ! Three's a crowd !  
 Person2:So what ?  
 Person1:        Just go ! It's Valentine's Day ! 

informal