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: T he nineteenth of June is my birthday . I'm planning to have a small party . Could you come ?
Person2:Happy birthday to you ! I'd really love to come , but I'm not sure right now . I'll try to make it.Thank you for your invitation .

Ex Output:
informal

Ex Input:
Person1: It seems so strange to be here , burying you , but it's not you .
Person2:Ashes to ashes and dust to dust ...
Person1: This has been the worst and best day of my life , Taylor . They kept you in the hospital , and ...
Person2:I'll tell you all about it another day .
Person1: But you're OK ? It was nothing serious , was it ?
Person2:You ladies look very elegant in black . But I don't want you to wear black in my honor for a long time yet to come ...

Ex Output:
informal

Ex Input:
Person1: Is this watch yours ?
Person2:No , it isn't mine . I blundered upon it under the sofa . Do youknow whose watch it is ?
Person1: Let me have a look . It's mine . I have been looking for it , but just cannot find it . It's present from my father .
Person2:Well , here you are . Remember to put it in a proper place .

Ex Output:
formal