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:       Hello , Janet . 
 Person2:Good morning , Pete . 
 Person1:        And what is this ? 
 Person2:Ah , this is my daughter's birthday present . Her birthday is next week . 
 Person1:        And when is your son's birthday ? 
 Person2:That is not for a while . His birthday is only in August . 
 Person1:        But Mark's birthday is in April so I need to think about his present soon . 
 Person2:And when is your birthday ? 
 Person1:        Oh , my birthday is in December just before Xmas so of course nobody remembers . 
 Person2:My birthday is in June , when we are always on holiday . So my family often forgets my birthday too . 

formal