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:       Hi , I ’ m testify chen , the tour guide for the Ged Agency . We have a reservation of twenty room for tonight .  
 Person2:Please to meet you Mrs Chen . My name is Joy . Welcome to the hotel . Here is the keys , registration slips and breakfast description . Breakfast will be served from seven tomorrow morning . Is there any change of your schedule ?  
 Person1:        No . Our check out time is still be eight thirty tomorrow .  
 Person2:And we arrange a morning call at seven thirty . Is that be fine ?  
 Person1:        That ’ s alright .  
 Person2:Please put your luggage outside your room by eight . The bail-boy will pick them up .  
 Person1:        Thank you .  
 Person2:Thank you very much . I hope you enjoy your stay . 

formal