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: I haven ' t met Bob for years . How is he ?
Person2:He has been keeping bach after divorce .
Person1: He would have recovered from the stress and got married again .
Person2:Once bitten , twice shy . He said he would rather keep bach than to live in disgust .

Output: formal

Input: Consider Input: Person1: Would you like to go to the movies tonight ?
Person2:Well , I just saw a horror movie last night . It almost frightened me to death .
Person1: Well , we could see something different like a detective film .
Person2:I don't care for a detective film . It also makes me nervous .
Person1: How about a comedy ?
Person2:No , I don't think comedies today are natural or cheerful .
Person1: How about a love story then ?
Person2:No , romance is boring .
Person1: What's you opinion ?
Person2:Let's go to see a war movie , shall we ?
Person1: Really ?
Person2:Certainly . Is there anything wrong ?
Person1: No , but I can't imagine that a girl like you would wonder to see a war movie .

Output: informal

Input: Consider Input: Person1: Accounting , this is Mike .
Person2:Mike , this is Leo in Sales . I was just calling to confirm our meeting tomorrow.Are we still on ?
Person1: Goodness ! It ' s been so long I actually forgot . Let me see ... yes , it is on my calendar .
Person2:OK . See you at your office at 2:30 .
Person1: Right , see you then !
Output: informal