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:       Excuse me ! Are you Bart Simpson from Western Electronics ? 
 Person2:Yes , I am . 
 Person1:        I am Steven . I am here to meet you . 
 Person2:Thank you for meeting me at the airport , Steven . 
 Person1:        You must be tired after the long flight . Let me carry the bags for you . 
 Person2:Thanks . Where is our car ? 
 Person1:        Our car is in the parking lot . We've booked a room for you . I will take you to the hotel soon . Let's go . 
 Person2:OK . Let's go . 

formal