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'.

Q: Person1: Plastic bags are widely used nowadays .
Person2:But they're hard to be disposed of .
Person1: In this aspect , I think , Pater bags have the edge on plastic bags .

A: informal
****
Q: Person1: Just make yourself at home .
Person2:Thank you . You are cooking up a storm .
Person1: Wouldn't you like some more chicken ?
Person2:No , thank you . I'm afraid I can't take in anymore .

A: informal
****
Q: Person1: Can I have my money back on this skirt ?
Person2:Anything wrong with it ?
Person1: Yes , this is defective . See ? I didn't notice this hole when I bought it .
Person2:Oh , I'm very sorry about that . You can change it for another one if you prefer .
Person1: If you have exactly the same one-same color , same design , and same size , of course .
Person2:This one is the same size and color . But the design is different .

A:
informal
****