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:       Don't talk too much , Tom . We are on duty today , we should hurry up .  
 Person2:OK .  
 Person1:        Tom , your task is to clean the blackboard .  
 Person2:How about yourself ?  
 Person1:        I'm going to sweep the floor first .  
 Person2:Daniel , I am not tall enough to reach the of the blackboard .  
 Person1:        Stand on the chair , Pig Tom . Use your brain .  
 Person2:OK , I've finished cleaning the blackboard .  
 Person1:        How about the podium ?  
 Person2:Oh , I forgot about it . I'll get it .  
 Person1:        Be quick , please . Our teacher and classmates will come soon .  
 Person2:I will be done before they come . 

formal