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:       How do you like the food here ? 
 Person2:I don't like it very much.But every-body likes their own food best . 
 Person1:        There are many things I miss . You can't get the ingredients here . 
 Person2:Are you sure ? All the big cities have specialty shops , which sell all sorts of ethnic foods . 
 Person1:        Perhaps . i just haven't had time to find them yet . 

formal