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 musical instrument do you play ?  
 Person2:I can play the piano a bit .  
 Person1:        Then we can have one more program at our party ?  
 Person2:No , no . My playing isn't good enough for me to perform in public . 

formal