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:       Yeah , it's really cute . But why a monkey suit ? Is Hello Kitty having an identity complex ?  
 Person2:No , she's wearing my Chinese zodiac sign .  
 Person1:        You were born in the year of the monkey ?  
 Person2:Yeah , are you surprised ?  
 Person1:        Not at all ! That explains everything ! 

informal