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:       Do you know much about computers ?  
 Person2:Not a great deal .  
 Person1:        I've just been reading an article about them.they ' ll be used for all sorts of things now .  
 Person2:For accounting system and things like that , you mean ?  
 Person1:        Yes , but they are used for other things , too.Do you remember when we went to buy a ticket for the flight to Paris .  
 Person2:Yes ?  
 Person1:        The man asked where we want to go , then he type out the information on the form and waited for a reply . A few moment later , he gave us two tickets .  
 Person2:Of course , his machine must have been connected to a computer .  
 Person1:        That's right . 

formal