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 really should be on my way . 
 Person2:Oh , not yet . At least have one for the road . 
 Person1:        No , thanks all the same . 
 Person2:Well , I am sorry you have to leave so early . 
 Person1:        Thank you very much . I really had a good time . 
 Person2:Well , thank you for coming . 
 Person1:        So see you . 
 Person2:Bye . 

informal