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:       I have a real problem when I meet people .  
 Person2:What is it ? Maybe I can help .  
 Person1:        I never know when to shake hands and when not to . Can you tell me something about it ?  
 Person2:Do you come from a country where they shake hands ?  
 Person1:        Oh yes . Men , women , and children shake hands all the time .  
 Person2:It ’ s very simple . Men shake hands , women and children don ’ t .  
 Person1:        But some women do shake hands . And now a lot of children have such good manners , they shake hands too .  
 Person2:Well , a good rule to follow is , for men you hold out your hand , for women and children , you wait and see what they do .  
 Person1:        That sounds easy enough .  
 Person2:Sure . Once you get the hang of it , it ’ s a piece of cake ! It ’ s nothing to worry about . 

informal