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: I would like you to meet my family . Can you come to dinner next week at my parents ' place ?
Person2:Yeuks ! Do they know anything about me ?
Person1: Actually , I've told them a lot about you . They are excited to meet you .
Person2:I'm a little nervous !
Person1: I think you'll like them . My family is pretty laid back .
Person2:How Ay people will be there at dinner ?
Person1: Let's see . there's my mom and dad and my two brothers and one of my sisters .
Person2:That's good , I'm usually more comfortable in bigger families .
Example Output: informal

Example Input: Person1: Jack , what's wrong ?
Person2:You !
Person1: What are you talking about ? What did I do ?
Person2:You told Martha that I was on a date ? What was that all about ?
Person1: No ... that's not what I meant . I didn't mean that . She asked me where you were and I jokingly said that you were on a date with Sara . I thought Martha knew that you and Sara were just friends .
Person2:She started feeling suspicious after you said that .
Person1: I'm sorry man . I didn't know . I didn't mean to screw anything up .
Person2:Martha gets jealous easily and it took a while to convince her that Sara was just a friend . Now , I have to explain to Sara that I can't hang around her because of you .
Person1: Look . I really didn't mean to , and next time I see Martha , I'll really tell her that you and Sara are really just friends .
Person2:Don't bother .
Example Output: informal

Example Input: Person1: Hello ! So you are leaving today .
Person2:Hello . Thank you for seeing me off . You actually don't need to bother .
Person1: It is my pleasure to see you off .
Person2:Thanks a lot . I hope to see you again .
Person1: I hope so , too .
Person2:Thanks again for everything you have done for me .
Person1: You're welcome . Have a nice trip !
Example Output:
informal