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:       Good afternoon , Sam .  
 Person2:Good afternoon , Tina .  
 Person1:        What are you going to do tomorrow ?  
 Person2:I'm not sure yet . And you ?  
 Person1:        I would like to go skating . Feel like going with me ?  
 Person2:Is skating interesting ?  
 Person1:        I think so . Fresh air , white snow . It's so comfortable .  
 Person2:But I can't skate well .  
 Person1:        It doesn't matter , I can teach you .  
 Person2:It's very kind of you . 

informal