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 , have you made a reservation ?  
 Person2:No , are there any vacant beds for us ?  
 Person1:        Of course.How do you like your room ?  
 Person2:Just an ordinary one , six people living in a room .  
 Person1:        OK , how long are you staying ?  
 Person2:3 days . 

formal