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 help you with today ?  
 Person2:I need to check out this book .  
 Person1:        Do you have your library card ?  
 Person2:I don ’ t have one .  
 Person1:        Would you like to apply for one right now ?  
 Person2:That ’ s fine .  
 Person1:        I ’ m going to need you to fill out the application .  
 Person2:All right . All done .  
 Person1:        All right , now please sign the back of the card .  
 Person2:Okay . I ’ Ve signed it .  
 Person1:        That ’ s all there is to it .  
 Person2:Great . Now can I check out this book ? 

formal