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 heard you're going to America tomorrow . I want to see you off at the airport .  
 Person2:Oh , thanks a lot .  
 Person1:        What time are you leaving ?  
 Person2:1 thirty P . m . But I've got to check in at 12 thirty P . m .  
 Person1:        What airline and what flight ?  
 Person2:Pan American Airlines . Flight 282 .  
 Person1:        I'll see you at the airport at 12 thirty P . m .  
 Person2:Ok . See you tomorrow . 

informal