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:       Excuse me .  
 Person2:Yes , Miss , what can I do for you ?  
 Person1:        I ordered my dish about a half an hour ago , but it hasn't arrived yet .  
 Person2:I'm sorry for that , I'm going to check with the chef right now . Miss , I just checked with the kitchen , and they said your order will be coming right up next . Oh , here comes .  
 Person1:        Thank you .  
 Person2:Miss , I'm very sorry for the delay , please enjoy this . Free a glass of wine for inconvenience . Again I'm terribly sorry to make you wait so long .  
 Person1:        It doesn't matter . 

informal