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:       Come in , young man .  
 Person2:( while shaking hands ) I am Zhang Wei , nice to meet you , sir .  
 Person1:        I am Smith , the personnel director . Please have a seat , son .  
 Person2:Thank you . Have you received my resume ?  
 Person1:        Actually , I haven ’ t had time to look it over . Did you bring another copy with you ?  
 Person2:Of course , here you are , sir .  
 Person1:        Call me Mr . Smith .  
 Person2:Certainly , it would be my pleasure , Mr . Smith . 

formal