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:       Can you study with the radio on ?  
 Person2:No , I listen to background music .  
 Person1:        What is the difference ?  
 Person2:The radio has too many comerials .  
 Person1:        That's true , but then you have to buy a record player . 

formal