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:       Steven , what are you thinking about ?  
 Person2:Oh , you know , tomorrow is Vicky's birthday . I am thinking what gift to give her .  
 Person1:        That's easy . A girl at her age must like beautiful ornaments . How about a hair pin ?  
 Person2:It's a bad idea . Vicky has short hair .  
 Person1:        Well , what about a brooch ?  
 Person2:Only old women like that .  
 Person1:        Maybe you should ask her what she wants for her birthday .  
 Person2:OK . That's what I can do . 

formal