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:       Do you have the notes from last week's class ?  
 Person2:Did you come late ?  
 Person1:        I couldn't make it .  
 Person2:Why is that ?  
 Person1:        I was sick .  
 Person2:Oh , okay . Well , here you go .  
 Person1:        Are these all of them ?  
 Person2:Oh , wait , here are the rest .  
 Person1:        Thanks a bunch .  
 Person2:Don't mention it . 

informal