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:       John , do you mind helping me prepare for the picnic ?  
 Person2:Sure . Have you checked the weather report ?  
 Person1:        Yes . It says it will be sunny all day . No sign of rain at all .  
 Person2:I'd like some toast and chicken wings .  
 Person1:        Okay . Please take some fruit salad and crackers for me .  
 Person2:Done . Oh , don't forget to take napkins , disposable plates , cups and picnic blanket .  
 Person1:        That's great . We can also take the dragon kite with us . After the picnic , we can fly it .  
 Person2:Cool , we can take shuttlecock and badminton racket .  
 Person1:        Okay , it sounds good . 

informal