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:       What would you like to order ?  
 Person2:I would like to have a hamburger .  
 Person1:        Did you want it with cheese ?  
 Person2:I don't want cheese on it .  
 Person1:        Did you want anything to drink ?  
 Person2:I think I'm going to get a soda today .  
 Person1:        What kind of soda can I get you ?  
 Person2:A Sprite sounds good .  
 Person1:        What else would you like ?  
 Person2:Let me get a bag of chips too .  
 Person1:        Anything else ?  
 Person2:That's all . 

formal