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: Cathy , I'd like to introduce the new microwave stove of mine to you , because it is easy to use .
Person2:OK , it so happened I want to buy one .
Person1: This microwave stove has many functions . Let me show you . For example , if you want to cook meat , you just need to put meat in it , and press the button with a picture of meat , that ' s OK . After several minutes , you can eat the delicious meat .
Person2:I think it ' s good , and it suits me , because I'm not good at cooking . Is it expensive ?
Person1: Oh , it is not so expensive . It only costs me 280 dollars .
[A]: formal

[Q]: Person1: I ' Ve got this really neat idea , you can hire a car and drive straight there .
Person2:Are you nuts ? What would my friends think if they see me in a hired car ?
Person1: But that ' s the quickest way to make your plans work .
Person2:Oh this is hard ! Well , I ' ll see what I can do .
[A]: informal

[Q]: Person1: Hi ! How are you going ?
Person2:Fine , thank you.How are you doing this morning ?
Person1: Not bad.How about you ? Haven't seen you for a long time .
Person2:Yes . I've been to New York . I got back only yesterday .
Person1: Did you enjoy yourself ?
Person2:Very much.New York is such a nice place.Shall I show you some photographs ?
Person1: Thanks , I like looking at photographs.How nice ! Oh , I'm afraid I must be going now . I've got an appointment . Have a good day .
Person2:You too . I hope to see you soon.Goodbye .
Person1: Goodbye .
[A]:
informal