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'.

Example Input: Person1: I have never you mention this friend . Are you on very good terms with him or her ?
Person2:We have been on good terms . She is a very nice girl . But she got in Dutch with her boss . I don ' t have the heart to see her pounding the pavements .
Person1: You must be stuck on her , or you would not use your elbow grease .
Person2:Well , we hit it off with each other . Nothing more , nothing much .
Example Output: formal

Example Input: Person1: Excuse me , I bought this sweater yesterday . But when I got home and tried it on , I found it ' s too small .
Person2:Do you have the receipt with you ?
Person1: Yes , here you are .
Person2:Thank you . Do you want your money back ?
Person1: No , can I exchange it for a bigger one ?
Person2:I am afraid this is the biggest size we have .
Person1: Oh , that's too bad .
Person2:Maybe you would like to try this one with the willow pattern . The price is the same and it's bigger .
Example Output: formal

Example Input: Person1: I've never met anyone like Clyde before .
Person2:He's such a buppie-a black yuppie . Black people come in all shapes and sizes . Just check out the party .
Person1: Wow ! There are so many different people here . I expected mostly athletes and rappers .
Person2:You'll find some of those here , too . But not if you don't shake it up ! There's an African saying , " If you can talk , you can sing ! If you can walk , you can dance ! "
Person1: Then I'll just shut up and sit down !
Example Output:
informal