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 may go grocery shopping later . 
 Person2:We need to get food ? 
 Person1:        I don't think we have any food . 
 Person2:What are you going to buy ? 
 Person1:        What food are we out of ? 
 Person2:Go and look in the kitchen . 
 Person1:        Could you look for me ? 
 Person2:You should just get the basics . 
 Person1:        What would that be ? 
 Person2:Get some eggs , milk , and bread . 
 Person1:        Would you please make a list for me ? 
 Person2:Okay , I'll write it down for you . 

formal