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 , May I have the time , please ?  
 Person2:Beg your pardon ?  
 Person1:        Er ... I'd like to know what time it is now .  
 Person2:Oh , Let me see ... It's three forty-five . Er ... wait , My watch is five minutes fast . So it should be three forty  
 Person1:        Thank you . By the way , what day is today ?  
 Person2:Today is Friday . Are you new in Beijing ?  
 Person1:        Yes , I've just come from the States , yesterday in fact . I'm still a bit confused about the time .  
 Person2:Welcome to Beijing . This is my business card . I'm an engineer . If you need any help in Beijing , just give me a call .  
 Person1:        Oh , that's very nice of you . I don't want to sound pushy , but I still l have one more question .  
 Person2:Go ahead .  
 Person1:        What's the date today ?  
 Person2:It's October the 1st , our National Day . I'd like to talk some more , but I've got to get going now . It was nice talking to you , though .  
 Person1:        Yeah , it was nice to meet you . Hope I run into you again sometime . 

informal