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:       Dad , why are you taping the windows ?  
 Person2:Honey , a typhoon is coming .  
 Person1:        Really ? Wow , I don't have to go to school tomorrow .  
 Person2:Jenny , come and help , we need to prepare more food .  
 Person1:        OK . Dad ! I'm coming . 

informal