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:       Would you like to come to our party ?  
 Person2:I'd like to . But I'm not myself today .  
 Person1:        what happened ? You look so pale .  
 Person2:It's the end of the world for me .  
 Person1:        What makes you say that ?  
 Person2:Today , I'm told I failed three courses .  
 Person1:        Oh , that's too bad . Work harder next term .  
 Person2:I'm such a fool that duplication of effort is only a waste of time to me .  
 Person1:        Don't loose heart . Everything will be fine .  
 Person2:I hope so . 

formal