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:       What can I do for you ?  
 Person2:I would like to use the copy machine .  
 Person1:        The machine is over there .  
 Person2:Do I have to pay to use the machine ?  
 Person1:        Yes , you will have to pay to use it .  
 Person2:How much ?  
 Person1:        It costs ten cents a copy .  
 Person2:Am I limited to a certain number of copies ?  
 Person1:        You can copy as much as you ’ d like .  
 Person2:Could you show me how to use the copier ?  
 Person1:        The instructions for the copier are posted on it .  
 Person2:That ’ s fabulous . Thank you . 

formal