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:       Good morning , Mr . Smith . Would you like to see around the factory ?  
 Person2:Yes , I would like to .  
 Person1:        This is our office block . We have all the administrative department here , Sales , Accounts , Personnel , Market Research and so on . 

informal