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:       How's your new car ?  
 Person2:Perfect ! Couldn't be better .  
 Person1:        You made a good choice , then ?  
 Person2:It's just what I want .  
 Person1:        No regrets .  
 Person2:I am really pleased with it .  
 Person1:        I am glad you are happy .  
 Person2:It's super . 

informal