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:       Do you know who ’ s just got married ? Old McDonald . 
 Person2:Never ! He ’ s over 80 , isn ’ t he ? 
 Person1:        He ’ s nearly 90 . 
 Person2:Good gracious ! Are you sure ? 
 Person1:        I am . What ’ s more , his wife is 84 . 
 Person2:Is she really ? 
 Person1:        Yes , she is . And guess what , he is her sixth husband . 
 Person2:Really ? Quite a woman , isn ’ t she ? 

informal