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:       how come you're still up ? Shouldn't you be asleep by now ?  
 Person2:I've been having a hard time sleeping lately .  
 Person1:        as far as I know , insomnia is usually caused by stress . Are you stressed at all ?  
 Person2:well , I'm really worried about my grades . I didn't think this course would be so stressful .  
 Person1:        you're a good student . I'm sure you can do well . What you need to do is to relax .  
 Person2:you're probably right . I just wish it were that simple . How can I stop feeling so anxious all the time ?  
 Person1:        taking a yoga class or learning some relaxation techniques can help you cope with your stress .  
 Person2:I don't really have time to learn anything new . I need to spend my time studying !  
 Person1:        you need to take some breaks throughout the day . Studying all day isn ’ t very usually effective .  
 Person2:you ’ re right . I usually end up starting at my computer or checking my email instead of doing my work for class .  
 Person1:        besides , it ’ s not difficult to learn yoga . In fact , I can teach you a move that ’ s supposed to help you fall asleep ! You just have to sit down like this , bend over and breath in deeply .  
 Person2:that ’ s fantastic . I ’ m going to go try that out in my room now . good night !  
 Person1:        good night , sleep tight ; don ’ t let the bed bugs bite ! 

informal