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:       So how's everything going for Christmas ? 
 Person2:I've got all the presents I need , and my family is working together to get all the food ready . That's easy , but I have another problem to deal with . 
 Person1:        What's that ? Don't tell me you've still got Christmas cards to write , it usually takes my wife a month to write all of ours . 
 Person2:No , I did that a long time ago . It's about telling my son the truth about Santa Claus . 
 Person1:        He still doesn't know that Santa isn't real ? How old is he , eight ? 
 Person2:Yes . He's never said anything so I never told him . But now that he's getting older ... 
 Person1:        You think it's better that he should be told ? 
 Person2:Yes , he's too old to believe in that type of things . And I'd rather tell him before the kids at school do . 
 Person1:        That happened to my oldest girl . She became really upset when her classmates told her Santa wasn't real . 
 Person2:I can understand . I was lucky with my oldest , she figured it out by herself and didn't tell my son . 
 Person1:        Well , when you tell him , be gentle . It's hard for kids to find out something like that . 

informal