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:       Have you got any plans for the coming holiday ?  
 Person2:Yes , I have a very special one . I will be doing volunteer work in a zoo for two weeks . A friend of mine working there told me the other day that they were in need of some volunteer keepers . I was very interested . So I asked him to get me the application form . Lucky , my application was approved by the manager very soon .  
 Person1:        Volunteer in a zoo ? What specific things will you do ?  
 Person2:I will help to prepare food , feed animals and clean up . I ’ m very excited about it now .  
 Person1:        It must be a unique experience . I ’ m looking forward to share your story when you come back .  
 Person2:Ok , I will bring you photos as many as possible . 

informal