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:       Your tree looks beautiful . Do you decorate it this way every year ?  
 Person2:Yes , it's a family tradition dating back to my childhood . We use the same lights and ornaments , but of course we have a new tree each year.The children made some of these decorations . Here , you can hang this on one of those high branches .  
 Person1:        Well , everything seems to be just about ready . Now all we need is snow.Do you exchange the presents in the morning ?  
 Person2:Oh , yes . The kids are too excited to wait . After we clean up the mess all the empty boxes and the wrapping paper we have a big breakfast . Then the kids have the whole day to play with their new toys .  
 Person1:        And we'll have a great turkey dinner at around four o'clock . My brother and his family will be joining us . I look forward to meeting them . Well , it's late , so I'll say good night . I'll see you early tomorrow , so I can share your Christmas morning.Good night ! 

informal