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:       I've come to say good-bye .  
 Person2:When are you off ?  
 Person1:        I'm flying home on Sunday afternoon .  
 Person2:Well , good-bye . See you soon .  
 Person1:        Please don't forget to say good-bye to the rest of the family for me . 

formal