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 ! Someone has reported a fault on one of your copiers .
Person2:That's right . I'm glad you're here . It hasn't been working properly for the last few days .
Person1: When was it serviced ?
Person2:Just a couple of weeks ago . It's usually very reliable .
Person1: What's actually wrong with it ?
Person2:Well , it's making a strange noise when we try to change paper trays .
Person1: I'm sure it's nothing serious , probably just a minor fault . I'll have a look at it .
Example Output: formal

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: On , darn . The grocery store is closed .
Person2:Yeah , this one closes at ten . We could drive to the 24 - hour store on sixth .
Person1: Alright . We are out of everything .
Person2:I wish the store close to us was open 24 - house a day .
Person1: I know , our schedules are so weird . Sometimes , the little corner store is the only thing within walking distance that ' s open when we get home .
Person2:Yeah , and the prices there are very high .
Person1: I know . Three dollars for milk .
Example Output:
informal