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:       Hello , Mr . Black , I'm calling to say goodbye . 
 Person2:You're leaving so soon ? I wish you stayed a little longer . 
 Person1:        I wish I could stay a little longer , but a lot of things to do back home . 
 Person2:Have you got the ticket ? 
 Person1:        Yes , I did . 
 Person2:What time are you going ? 
 Person1:        At 11:00 o'clock . 
 Person2:I'll pick you up by nine o'clock and take you straight to the airport . 
 Person1:        No , I'll go by myself , thanks . 
 Person2:OK , goodbye . 

informal