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:       May I help you ?  
 Person2:Yes , I would like to check in .  
 Person1:        Do you have a reservation ?  
 Person2:Yes , my name is Carol Tiang . That's spelled J - I - A - N - G .  
 Person1:        I'm sorry , Ma'am . I can't find anything under that name.Do you have your confirmation number ?  
 Person2:No , I don't have it with me.But I know I have a reservation . My husband made it for me last month .  
 Person1:        Well , let me look again . How do you spell your first name , Ma'am ?  
 Person2:C - A - R - O - L . Carol .  
 Person1:        I don't find a Carol in the computer for today . I have a Carol Larson here . But that reservation is for next Monday .  
 Person2:No , that's not me . My name is Tiang , not Larson . My husband reserved for me .  
 Person1:        Are you sure he used your name , Ma'am ? Maybe he reserved under his name .  
 Person2:His name is Lin , L - I - N .  
 Person1:        I'm sorry . I have nothing here .  
 Person2:Miss , I know he made this reservation for me . 

formal