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'm exhausted . My new exercise is so hard .  
 Person2:I think it is easy . I could work in your class with no problem .  
 Person1:        You thing so ?  
 Person2:Oh , without doubt.When is the next class ?  
 Person1:        Tomorrow morning.Try it .  
 Person2:No problem .  
 Person1:        Are you going to this class this morning ?  
 Person2:Of course , easy.No sweat .  
 Person1:        You're no able to move after this class .  
 Person2:Are you kidding me ? It's going to be up a piece of cake .  
 Person1:        You want to bet ?  
 Person2:Yeah , what't the bet ?  
 Person1:        I bet I can go one hour in your class this morning and not feel a thing . 

formal