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: Good afternoon.Swiss Airline.Miss Grown speaking . Can I help you ?
Person2:Yes . I'd like to make a reservation to Los Angeles on Sep . 19th .
Person1: Just a moment , please . Let me check for you . ( A moment later ) Thank you for waiting . I am sorry but our flights are fully booked on that day.The next available flight leaves at 4:00 pm on 20th . Shall I reserve you a seat on it ?
Person2:Yes , please , thank you .

Output: formal

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: Do you have a family tradition at Christmas time ?
Person2:We have so Ay ! But my favorite happens at Christmas Eve .
Person1: What is it ?
Person2:Well , all the brothers and sisters get together and fill the Christmas stockings for the litt 1e kids .
Person1: That's it ? That's the tradition ?
Person2:Well , in fact it's fun for us to just be together that night and do this one thing .
Person1: I guess the spirit of it is what really makes any tradition fun .
Person2:You should be there some Christmas Eve .
Output: formal