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:       How may I help you today ? 
 Person2:I need to make some copies . 
 Person1:        The copier is right over there . 
 Person2:Does it cost to use it ? 
 Person1:        We do charge to use the machine . 
 Person2:How much does it cost ? 
 Person1:        We charge ten cents a copy . 
 Person2:How many copies am I allowed to make ? 
 Person1:        There is no limit to how many copies you can make . 
 Person2:Would you mind showing me how to use it ? 
 Person1:        Please read the instructions on the copier . 
 Person2:Oh , okay . Thanks . 

formal