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:       Good afternoon . Reservations . May I help you ? 
 Person2:Yes , I'm calling from Tenga Company . I'd like to know if you have rooms available for the nights from October 8 to October 12 . We are going to have a business conference . 
 Person1:        May I ask how many people there will be in the party ? 
 Person2:20 persons . 
 Person1:        What kind of room would you like ? 
 Person2:Double rooms with twin beds . 
 Person1:        A moment please , sir . Yes , I can confirm 10 rooms for those days . 
 Person2:Thank you . Is there a special rate for a group reservation ? 
 Person1:        Yes , there is a 10 percent discount . 
 Person2:That is fine . 

formal