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:       I need help preparing for my presentation on Friday .  
 Person2:I could help you with that .  
 Person1:        Are you sure you have the time ?  
 Person2:I promise you that I have the time to do this . If I didn't , I wouldn't offer to help .  
 Person1:        What would be the best time for you to help me ?  
 Person2:Tomorrow night would work for me .  
 Person1:        Should we just meet here ?  
 Person2:OK , and I'll bring some information that helped me with my presentation .  
 Person1:        I'll see you then .  
 Person2:See you tomorrow night . 

formal