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 , madam . I'd like to apply for a library card . Can you help me ?  
 Person2:Yes . Please give me your ID card , a photo .  
 Person1:        OK . Here you are .  
 Person2:Then you have to give me 15 dollars for the deposit . The library card is free .  
 Person1:        OK . Here is the money . And If I return the card , can I get the refund ?  
 Person2:Of course , as long as the card is well kept .  
 Person1:        OK . I see . Thank you .  
 Person2:You are welcome . 

informal