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'.

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