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'.

Ex Input:
Person1: David , I ' m going to China .
Person2:Really ? How do you get the chance ?
Person1: You know . I took part in the Chinese contest . I was the best and they gave me this reward . I don ' t have to pay for my trip .
Person2:Congratulations . How lucky you are !
Person1: Thank you . I ' m leaving tomorrow morning .
Person2:I ' m sure you ' ll enjoy the trip . China is such a beautiful country .
Person1: I ' m sure I will .
Person2:Have a nice journey , Lily .
Person1: Thank you , David .

Ex Output:
informal

Ex Input:
Person1: Mom ! How can I help with the washing up ?
Person2:You peel the onions and wash them , then chop them .
Person1: OK ! Then what can I do after I finish it ?
Person2:Let me see . Wash the cabbage over there .
Person1: OK , got it .
Person2:What is your father doing now ?
Person1: Reading newspaper on the couch .
Person2:How about Daniel ?
Person1: Staying with Ultraman , of course . You know he likes it very much .
Person2:Be careful of the peeler . Don't cut your fingers .
Person1: I will .
Person2:OK , we've finished . Can you get your father and brother ?
Person1: OK !

Ex Output:
informal

Ex Input:
Person1: How may I help you today ?
Person2:I need to make some copies .
Person1: The copier is right over there .
Person2:Does it cost to use it ?
Person1: We do charge to use the machine .
Person2:How much does it cost ?
Person1: We charge ten cents a copy .
Person2:How many copies am I allowed to make ?
Person1: There is no limit to how many copies you can make .
Person2:Would you mind showing me how to use it ?
Person1: Please read the instructions on the copier .
Person2:Oh , okay . Thanks .

Ex Output:
formal