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: Are you going to the party on Saturday ?
Person2:I was thinking about it . Are you ?
Person1: Yeah , I heard it's going to be a lot of fun .
Person2:Really ? Well , what time does it start ?
Person1: It starts at 8
Person2:Well , who all is going to be there ?
Person1: Everyone from school .
Person2:How do you know it's going to be so fun ?
Person1: This party is going to have a DJ , food , and drinks .
Person2:Wow , that does sound like it's going to be fun .
Person1: So am I going to see you at the party ?
Person2:Yeah , I will be there .

Output: informal

Input: Consider Input: Person1: What's the matter , Lisa ? You don't look too good .
Person2:I just found out that my husband is cheating on me .
Person1: You mean Mark ? He seems like such an honest guy .
Person2:That's what I thought . It seems that he's been seeing someone else for about two months .
Person1: Two months ? How did you find out ?
Person2:I asked for leave and was at home when the telephone rang . I picked it up and a girl asked to talk to Mark . She then asked if I was his sister , and I said no , I was his wife . She hung up immediately .
Person1: So you asked him about the girl who called ?
Person2:Yeah , he first said it was someone from work . He gave me a lame excuse , and so I pressed him on it .
Person1: What'd he do ?
Person2:He kept trying to make stupid excuses , and then broke down and admitted to a small indiscretion .

Output: formal

Input: Consider Input: Person1: Did you like the play ?
Person2:Not really . It's a dull one , and the production isn't satisfactory , either .
Person1: You're absolutely right . The acting could be better .
Person2:To be fair , though , both the costumes and scenery are marvelous .
Output: formal