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 am looking for a pan .  
 Person2:No problem . What size would you like ?  
 Person1:        A big one would be nice .  
 Person2:How about this one ? It's our biggest — 16 ' in diameter .  
 Person1:        Oh , yes , I like that one , but it's too heavy .  
 Person2:Okay , try this one . It's made of aluminum .  
 Person1:        Oh , yes ! This is much better . But it has an aluminum handle .  
 Person2:Here you go . Same pan , but with a state-of-the-art , heat-resistant plastic handle .  
 Person1:        Yes . That's perfect . I'll take it .  
 Person2:Great . Will that be cash or charge ?  
 Person1:        Oh , wait a minute . What about a lid for the pan ?  
 Person2:I'm sorry . I forgot to show you the lid . It comes with the pan . 

informal