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:       Hello , Lily .  
 Person2:Hello , Mr . Clark . You ’ re early for lunch . It ’ s only eleven o ’ clock .  
 Person1:        When I come late , there ’ s usually nothing left .  
 Person2:What would you like today ?  
 Person1:        I ’ ll have the leg of lamb .  
 Person2:And would you like salad ? The salad plate today is lettuce , tomatoes , and black olives . 

formal