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:       Good evening , can I get you a drink ?  
 Person2:Sure , I would like a Coke .  
 Person1:        Would you like to order anything off the appetizer menu ?  
 Person2:Let's see , can I get some fried zucchini , please ?  
 Person1:        Would you like to order anything else ?  
 Person2:No , that's it , thank you .  
 Person1:        No problem , call me when you're ready to place the rest of your order .  
 Person2:I would like to order my food now .  
 Person1:        What did you want to order ?  
 Person2:Can I get a cheeseburger and some fries ?  
 Person1:        Can I get you anything else ?  
 Person2:That's all , thank you . 

informal