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:       Have you always been on this site ?  
 Person2:No , we used to be on an industrial estate on the outskirts of York .  
 Person1:        Why did you move ?  
 Person2:We needed larger premises so we moved to this greenfield site last year . It's nearer the motorway so it's better for transportation . 

formal