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:       Can I take your order please ?  
 Person2:Can I get a burger and a large fries ?  
 Person1:        Sure . Anything to drink with that ?  
 Person2:A large coke , please .  
 Person1:        Eating here or to go ?  
 Person2:Eating here , please .  
 Person1:        That's 7 dollars and 25 cents . You can get free refills with your coke . 

informal