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:       Good morning . I want to apply for a library card . 
 Person2:Give me 10 yuan , your ID card and a photo of you please . 
 Person1:        But I hear that the card is free . 
 Person2:Yes , it is . But you must pay a deposit for the card . 
 Person1:        There will be a refund when I return the card , right ? 
 Person2:Yes , if the card is well kept and has no dirt and scratches . 
 Person1:        OK , here you are . 

formal