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:       Let's decide what to order .  
 Person2:I'll have a hamburger .  
 Person1:        The works ?  
 Person2:No , just tomatoes , please . And large fries .  
 Person1:        Anything to drink ?  
 Person2:A small cola .  
 Person1:        I'll have a sandwich and small fries . Would you like to have some desserts ?  
 Person2:Apple pie is my favorite dessert .  
 Person1:        I'd like to have an ice cream 

formal