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'.

Person1: You look happy .
Person2:I am happy . I just bought a new car .
Person1: Wow ! Is it a good car ?
Person2:It ' s a great car . It ' s very comfortable and it goes really fast .
Person1: Was it expensive ?
Person2:Put it this way it wasn ' t cheap .
Person1: What colour is it ?
Person2:It ' s red and black .
informal

Person1: Why are you so late ?
Person2:I've been through a lot today . I forgot to set my alarm clock last night , so I woke up late this morning . And what is worse , I missed the school bus .
Person1: That's enough . Sit down .
informal

Person1: Who will meet you at the airport ?
Person2:No one .
Person1: Oh , then I will arrange one of my staff to meet you at the airport .
formal