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:       Hello , May I help you ?  
 Person2:Yes , we're interested in seeing the rooms for rent .  
 Person1:        Oh , how nice ! there are bright rooms and the house is very quiet .  
 Person2:That is exactly what we're looking for .  
 Person1:        Well , each room is 40 dollars a week .  
 Person2:That sounds all right to us .  
 Person1:        When do you want to move in ?  
 Person2:How about tomorrow afternoon ?  
 Person1:        Fine , I'll be expecting you .  
 Person2:See you tomorrow . 

informal