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:       I would like to register for a class today .  
 Person2:No problem , what class would you like to take ?  
 Person1:        I would very much enjoy taking a Psychology class.Because I'm crazy .  
 Person2:There are two classes that are still open .  
 Person1:        Which days are these classes on ?  
 Person2:The first class is a Tuesday and Thursday class from two to three .  
 Person1:        What about the other class ?  
 Person2:The other class is on Monday and Wednesday from 10 am - 12 .  
 Person1:        Are you sure there are no more open classes ?  
 Person2:I'm positive .  
 Person1:        Sign me up for Monday and Wednesday .  
 Person2:Okay , I'll sign you up . 

formal