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: May I know how old you are ?
Person2:I am 24 .
Person1: What is your date of birth ?
Person2:I was born on April 15 , 1986 .
Example Output: formal

Example Input: Person1: Can we go to the beach on foot ?
Person2:Oh , it's too far to walk there.We can take a bus .
Person1: Is the bus station close by ?
Person2:Yeah , it's a block away down the street .
Example Output: formal

Example Input: Person1: What do you do when you are angry ?
Person2:I usually calm down first and think about the reason that caused my anger .
Person1: That ' s smart . What do you usually do to relieve your anger ?
Person2:Something like listening to music is a good idea .
Person1: Oh , what kind of music do you listen to ?
Person2:Classic . Something that could calm your mind .
Person1: I think that might work for me as well .
Person2:Working out is another good way to relieve anger .
Person1: Like what ?
Person2:Jogging , yoga , or even just taking a walk .
Example Output:
informal