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 many undergraduates are hired here each year ?  
 Person2:Normally , about 60 people . But it may depend .  
 Person1:        I see . What kind of backgrounds does the staff have ?  
 Person2:About 20 % of them come from other countries and the others are employed from domestic universities and colleges . 

formal