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'.

Example Input: Person1: Hi , I want to see the Terra Cotta Warriors in Xi'an . Could you please remind me when we are arriving at that stop ?
Person2:Oh . You took the wrong bus . You need to take Bus 151 which goes the opposite direction .
Person1: Oh , no ! What should I do now ?
Person2:Don't worry . You can get off at the next stop and walk across the street and take the Bus 151 to the opposite direction .
Person1: Ok . How many stops do I have to go ?
Person2:About 15 stops .
Person1: That is a long way to go . It is so kind of you to help me . Thank you very much .
Person2:My pleasure .
Example Output: informal

Example Input: Person1: Hi , Janice . Our first weekend after being employed is coming . Show me your plan .
Person2:My mom phoned me this morning , and asked me to go back home to have housework chores .
Person1: What are you assigned to do ?
Person2:God knows . Speaking of chores , I would rather do some washing than cooking .
Person1: For me , I think I will iron my shirt and trousers . Actually , weekends tend to be the most hectic day in the whole week .
Person2:I really hope that I could sleep like a log all through two nights . But ... Some one said that weekends are a bit like rainbows ; they look good from a distance but disappear before we get up close to them .
Person1: I couldn't agree more .
Example Output: formal

Example Input: Person1: Mary didn't pass the final exam in physics .
Person2:She must be very sad .
Person1: Her parents scolded her severely and she's very depressed now .
Person2:At a time like this , what she needs is a pat on the back rather than a blame .
Example Output:
informal