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 ?  
 Person2:I need to get on the Internet .  
 Person1:        Do you have your library card with you ?  
 Person2:Yes , I have it .  
 Person1:        You ’ re going to have to wait for a computer .  
 Person2:That ’ s okay .  
 Person1:        Please put your name on this list .  
 Person2:Then what do I need to do ?  
 Person1:        When there is a computer available , I will call you .  
 Person2:What do I do to log on to the computer ?  
 Person1:        Just type in the number on the back of your library card .  
 Person2:Okay . Thanks for your help . 

informal