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:       Many happy returns of the day , darling ? 
 Person2:Thank you very much . 
 Person1:        And here is your birthday present . 
 Person2:A gold watch ! 
 Person1:        Do you like it ? 
 Person2:I love it ! Darling , you ’ re kind . 

informal