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:       What's the date today Mr.Brown ? I don't have a calendar .  
 Person2:Today is Tuesday , 25th September , 2001 .  
 Person1:        25th Sep ? Oh , I have an appointment tonight .  
 Person2:What time is your appointment ?  
 Person1:        It is at 8 o'clock .  
 Person2:What time is now ? Do you have the correct time ?  
 Person1:        I don't know what time it is .  
 Person2:It must be about 6 o'clock .  
 Person1:        I have to go now . I don't want to be late .  
 Person2:You won't be late . It's still early . 

formal