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's your work ? 
 Person2:Good , thanks . How about you ? 
 Person1:        Not bad . But we have lost a few of staff lately . 
 Person2:Why ? 
 Person1:        Because of the low salaries . 
 Person2:But your company is huge . Can't they afford to pay the staff decent wages ? 
 Person1:        I don't know why . 
 Person2:Why don't you give them a suggestion ? 
 Person1:        May be I can have a try . But I'm on vacation now . 

formal