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 am really impressed with your presentation skills .  
 Person2:Thank you . I have been working on it for several years .  
 Person1:        Well , your time has been well spent !  
 Person2:It also helps that I have strong team members , such as yourself . You really know your stuff !  
 Person1:        Thanks , but I have to admit I am really good at bluffing ! 

informal