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:       Good afternoon . I believe that this house is for sale . 
 Person2:That's right . 
 Person1:        May I have a look at it please ? 
 Person2:Yes , of course . Come in . 
 Person1:        How long have you lived here ? 
 Person2:I have lived here for twenty years . 
 Person1:        Twenty years ! That's a long time . 
 Person2:Yes , I have been here since 1976 . 
 Person1:        Then why do you want to sell it ? 
 Person2:Because I have just retired . I want to buy a small house in the country . 
 Person1:        How much does this house cost ? 
 Person2:6850 pound . 
 Person1:        That's a lot of money ! 
 Person2:It's worth every penny of it . 
 Person1:        Well , I like the house , but I can't decide yet . My wife must see it first . 
 Person2:Women always have the last word . 

informal