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 give me a taxi to pick me up and take me to the airport before 1:00 p . m . ? 
 Person2:What is your address , sir ? 
 Person1:        I live in room 1106 of the Friendship Hotel . 
 Person2:OK , someone will be there by 12:15 . 

formal