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:       Could you tell me what university you want to go to , John ?  
 Person2:Pardon ?  
 Person1:        What university would you enter ?  
 Person2:University ? Why ? You asked me last year .  
 Person1:        Oh , I forget.Sorry .  
 Person2:I went to Harvard University .  
 Person1:        Did you ? And what course did you take there ?  
 Person2:God save me ! Is there anything wrong with you ? Didn't I tell you ?  
 Person1:        I've not known.Perhaps , I've got a bad memory .  
 Person2:I did a B . A . in economics.Remember ?  
 Person1:        Terrific ! B . A . , again and again-B . A . 

informal