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:       Speed Airlines Reservation . May I help you ?  
 Person2:Yes . Do you have any flight to Paris on 15th ? I want one leaving in the afternoon .  
 Person1:        Yes . Flight DP336 leaves at 15:16 . Is that all right ?  
 Person2:Is it a direct flight ?  
 Person1:        No , Sir.It has an hour layover in London .  
 Person2:Well , I don't think I want it . 

formal