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:       I'll have sole , then .  
 Person2:All right.How about other guests ?  
 Person1:        The rest of us will have this today's special , please .  
 Person2:OK .  
 Person1:        I'm sorry but I ordered sole , not the same as the others.Will you change it ?  
 Person2:I'm afraid we have no more sole .  
 Person1:        Then , I'll have this pork cute instead .  
 Person2:Certainly.Just a moment , sir . 

informal