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 any toast , dear ?  
 Person2:Um ?  
 Person1:        Toast , dear ?  
 Person2:As you like .  
 Person1:        Would you like any tea , dear ?  
 Person2:It doesn ’ t make any difference to me .  
 Person1:        Oh , you ’ re not listening to me .  
 Person2:Leave me alone . 

formal