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:       Could you have a taxi pick me up and take me to the airport before 1 p . m . ? 
 Person2:What's your address , sir ? 
 Person1:        I live at 323 Park Street . 
 Person2:Ok , someone will be there by 12:15 . 
 Person1:        What are your rates ? 
 Person2:It's 2 dollars initially and 35 cents for each quarter mile . 
 Person1:        I have four very large suitcases . Will those fit in the taxi ? 
 Person2:No , I'll send a larger vehicle to pick you up . 

formal