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'.

Input: Consider Input: Person1: My sister was taken to the hospital yesterday
Person2:What happened ?
Person1: She was hit by a car . Luckily , she wasn't seriously hurt .
Person2:Let's buy some flowers , and pay her a visit
Person1: We'll have to hurry ; visiting hours will be over soon
Person2:OK . Let's go

Output: formal

Input: Consider Input: 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 .

Output: informal

Input: Consider Input: Person1: Mom ?
Person2:Mm ?
Person1: Can my friend , Tom Mitchum , come home with me for lunch tomorrow ?
Person2:Of course , Jim . Have I met Tom before ?
Person1: Mm hmm . You met him last summer . He is small and very smart .
Person2:Oh , yes . I remember Tom . His family comes from Maine , right ?
Person1: Yes .
Output: formal