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:       Shall we have some soup first ?  
 Person2:No , thank you . I don't like soup . I'd rather have some fruit juice to start with .  
 Person1:        Ok , and what about the main course ? Which would you rather have fish or meat ?  
 Person2:Meat , I think .  
 Person1:        Don't you like fish then ?  
 Person2:I do , but I want meat .  
 Person1:        Shall we have some white wine then ?  
 Person2:Yes , but I prefer red wine with meat .  
 Person1:        What would you like for dessert ?  
 Person2:I just want to have a coffee , I think .  
 Person1:        Fine , and after dinner , shall we go to a disco ?  
 Person2:No , thanks . I'd like to go straight home . I'm very tired . 

informal