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: Your total comes to $ 36.78 .
Person2:Put it on my VISA .
Person1: There ' s a problem with your card .
Person2:What ' s wrong with it ?
Person1: I believe it was declined .
Person2:You ' re kidding me !
Person1: Do you have another card I could try ?
Person2:I only have one card .
Person1: Do you have cash , perhaps ?
Person2:I don ' t have any cash on me .
Person1: You ' re not going to be able to take these items today .
Person2:I ' ll be back tomorrow .

Output: informal

Input: Consider Input: Person1: Ma , I really don't know how to thank you .
Person2:I'm glad I was able to help .
Person1: It's most kind of you .
Person2:Don't mention it . It was the least I could do .
Person1: If there's ever anything I can do for you , Don't hesitate to let me know .
Person2:Thank you .
Person1: I'm most grateful .
Person2:It was a pleasure .

Output: informal

Input: Consider Input: Person1: You'd better prepare for the examination .
Person2:I don't think the exam will be very hard .
Person1: You should change your attitude , or you will not pass the course .
Person2:Maybe you're right . I have been too lazy lately .
Output: informal