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:       Excuse me.sir . Can I have look at the timetable please ?  
 Person2:Surely of course.Here you are .  
 Person1:        Is flight ZW203 a direct one ?  
 Person2:No , it stopped at Honolulu.Would you like to book one ?  
 Person1:        No . Is there any direct flight to New York ?  
 Person2:Let me see . I am sorry . ZW203 is the only one to New York . 

formal