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:       So , are we all behind this new project ?  
 Person2:I'm in favor of Maggie .  
 Person1:        Ditto , it doesn't look too expensive either .  
 Person2:That's right , Nigel . I think we can keep cost down .  
 Person1:        I can't see a problem . Let's give it a try . 

formal