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:       May I speak to Mrs . Liu , please ? 
 Person2:This is Liu Fang speaking . 
 Person1:        Oh , good morning , Mrs . Liu . I'm calling to see if you have received my resume that I sent to you by Email . 
 Person2:May I have your name , please ? 
 Person1:        My name is Steven . May I ask whether I can have an interview ? 
 Person2:Of course . In my opinion , you are the strongest candidate for the job . 
 Person1:        When is it most convenient for me to visit you to talk about the position ? 
 Person2:I want to set up an interview for you at 9 a . m . next Monday in our company's conference room . 
 Person1:        Thank you very much . See you then . 

informal