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:       For our lunch meeting with the investors , do we have to make a reservation at the restaurant or do we just show up ?  
 Person2:Usually for lunch , we don't have to reserve a table , they should allow walk-ins . But to be on the safe side , I'll order a table for half-past twelve . Will that suit your schedule ?  
 Person1:        I've arranged to meet them at the restaurant at twelve . Can you make the reservation a little earlier ? If we start earlier , it will give us more time for a longer lunch .  
 Person2:Are you planning on treating the investors to a full-course meal ?  
 Person1:        Yes , we'll start with appetizers , follow with a soup and salad course , then main dishes of prime rib or cordon bleu chicken , and finish up with a delicious rich dessert of some sort .  
 Person2:That'll be pretty heavy for a mid-day meal , don't you think ?  
 Person1:        As along as we stay away from anything alcoholic , we should be okay .  
 Person2:With your prime rib and chicken choices , you'd better hope nobody's vegetarian .  
 Person1:        We can make some special arrangement if we need to . After all , it's the company who is footing the bill . 

formal