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 mind if I borrow the notes from last week ?  
 Person2:Were you here last week ?  
 Person1:        I was unable to make it .  
 Person2:How come ?  
 Person1:        I was sick that day , and couldn't make it .  
 Person2:Well , here are the notes .  
 Person1:        Are there any more ?  
 Person2:Sorry , here you go .  
 Person1:        Thanks a lot .  
 Person2:No problem . 

informal