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:       Could you help me ?  
 Person2:What do you need ?  
 Person1:        I can't seem to find my class .  
 Person2:What building is it in ?  
 Person1:        It's in the C building .  
 Person2:Oh , I know exactly where that is .  
 Person1:        Do you think you can tell me where it is ?  
 Person2:Sure , what room number is it ?  
 Person1:        It's room number 261 .  
 Person2:I have a class around there right now .  
 Person1:        Could you show me where it is ?  
 Person2:No problem , come on . 

formal