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:What time will the library be closing ?  
 Person1:        It closes at six .  
 Person2:Does it always close at six ?  
 Person1:        No , not every day .  
 Person2:Will the library be open on Saturday ?  
 Person1:        Absolutely .  
 Person2:What are your hours on Saturday ?  
 Person1:        Saturday ’ s hours are from nine in the morning to six-thirty at night .  
 Person2:All right . Thank you .  
 Person1:        What else can I help you with ?  
 Person2:That ’ s it . Thank you . 

informal