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'd like to say good-bye to everyone .  
 Person2:What time are you going ?  
 Person1:        My plane leaves at seven twenty-five .  
 Person2:Well , good-bye and have a good trip !  
 Person1:        Good-bye . Remember to look me up if you're ever in Washington . 

informal