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'.

Person1: Harry , do you like the opera ?
Person2:No , not really .
Person1: Why is that ? It is called real art .
Person2:Well , it's very expensive and they're usually singing in another language . That kind of gets on my nerves .
Person1: Yeah , that makes sense .
informal

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 .
informal

Person1: Hello , this is Chen Kun . I am booked on flight LJ88 for Barcelona on Jan . 19th .
Person2:Hold on please ... Yes , you are booked already .
Person1: Now I am afraid I can't get to the airport on that day . I want to change my flight for the 21st.Is that all right ?
Person2:I am sorry.Flight LJ88 0n that day is full . What about 22 ?
Person1: Fine.Thank you so much .
informal