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:       Are you ready to order now , sir ?  
 Person2:Yes .  
 Person1:        Would you like an appetizer ?  
 Person2:Yes . I'd like a crab cocktail .  
 Person1:        Would you like some soup first ?  
 Person2:Very well .  
 Person1:        What kind of soup would you like ?  
 Person2:I want egg soup .  
 Person1:        Have you decided on anything ?  
 Person2:I'd like to have some meat .  
 Person1:        How about stewed-fried steamed pork ?  
 Person2:No , thank you .  
 Person1:        Are you interested in today's special ?  
 Person2:What is it ?  
 Person1:        Twice cooked spicy pork slices .  
 Person2:OK . Let me try it .  
 Person1:        Anything else ?  
 Person2:No , thank you 

formal