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 just received a phone call for an interview next week .  
 Person2:Congratulations ! This is your first interview ever .  
 Person1:        thank you , but I'm nervous . I don't know what to do.Could you tell me what should I do before an interview ?  
 Person2:sure , you should prepare so that you can give proper response when you're being interviewed .  
 Person1:        yeah , besides my personal introduction , what else should I prepare ?  
 Person2:you should collect as much information about the company and the position you're applying for as you can . It is important to show that you've done some research into the company . The interviewers Wil  
 Person1:        then what should I do when I'm being interviewed ?  
 Person2:smile at the interviewers and look them in their eyes while trying to persuade them to select you . Try to act natural , let your personality , ability and interpersonal skills shine through the interview  
 Person1:        are there any other things I should pay attention to ?  
 Person2:yeah , wear formal clothes to your interview and do be punctual . That'll leave your interviewers with a good first impression . 

informal