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 , I need your assistance . 
 Person2:Sure , what's up ? 
 Person1:        I have no idea where my class is . 
 Person2:Tell me which building it's in . 
 Person1:        My class is in the C building . 
 Person2:I know where the C building is . 
 Person1:        Do you mind telling me where it is ? 
 Person2:Of course , which room number is it ? 
 Person1:        Number 261 . 
 Person2:I actually have a class right around there . 
 Person1:        Can you please show me ? 
 Person2:I can do that . 

formal