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:       Hi , happy new year !  
 Person2:Hey , the same to you !  
 Person1:        Time flies ! One year has already been a history !  
 Person2:Definitely , it's time to say bye-bye to the last year and to say hello to the new year !  
 Person1:        Yeah . Have you made any good resolutions for this new year ?  
 Person2:Some resolutions ? That's a wonderful idea , but I have no idea yet . How about you ?  
 Person1:        I want to be healthier this year , so I think I should take more exercise .  
 Person2:That will be a good one ! Anything else ?  
 Person1:        Maybe I should make a plan about learning my biochemistry , which is a mess !  
 Person2:Sounds great ! 

informal