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:       Susan , good evening . Why are you so dressed up ? 
 Person2:I am on my way out to a New Year ’ s banquet . How do I look ? Is my make-up OK ? 
 Person1:        You look great . Your make-up is perfect . 
 Person2:Do you think I should wear a different dress ? 
 Person1:        No , the one you have on looks fabulous , especially with your hair like that . 
 Person2:Thanks for saying . Do you have any ideas which necklace I should wear ? 
 Person1:        With that dress I'd say your white diamond necklace would look perfect . 
 Person2:Thanks for helping out . Now that I ’ m ready , what are you doing tonight ? 
 Person1:        Not much , just a house party with some friends . 
 Person2:Sounds fun . Anyone I know ? 
 Person1:        Yeah , most of the people are from our office . 
 Person2:Sounds Like I'm missing out on a good time . Oh , well , there is always next year . 
 Person1:        I ’ m sure you ’ ll have fun no matter where you go . Remember to take your bag . 

informal