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'm looking for a pan I can use in my kitchen .  
 Person2:What size pan were you thinking of ?  
 Person1:        I've already got a small pan . I need a big one .  
 Person2:Well , this one might work for you .  
 Person1:        Oh , no , that's way too heavy a pan for me .  
 Person2:Here , lift this aluminum pan . It's the same size .  
 Person1:        Yes , it's very lightweight . But I don't want this aluminum handle .  
 Person2:Here's a similar aluminum pan . But it has a heat-resistant handle .  
 Person1:        Oh , this feels very nice . It's perfect . I'll take it .  
 Person2:I knew we'd find the right pan sooner or later . How would you like to pay ?  
 Person1:        Cash . But first , I need a lid for this pan .  
 Person2:Oh , no problem . Here's the lid that comes with the pan . 

informal