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:       Oh , no . It seems that I've lost my train ticket . 
 Person2:Are you kidding ? The train leaves in an hour . Where did you put it ? 
 Person1:        It was in my pocket , but now I can't find it . 
 Person2:Is it in the other pocket ? 
 Person1:        No , it is not here . Damn it ! I'm going to have to buy another ticket . 
 Person2:Let's go to the inquiry desk first to check whether anyone has got it and turned it in . 
 Person1:        OK . 

informal