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'.

Q: Person1: Good afternoon.Swiss Airline.Miss Grown speaking . Can I help you ?
Person2:Yes . I'd like to make a reservation to Los Angeles on Sep . 19th .
Person1: Just a moment , please . Let me check for you . ( A moment later ) Thank you for waiting . I am sorry but our flights are fully booked on that day.The next available flight leaves at 4:00 pm on 20th . Shall I reserve you a seat on it ?
Person2:Yes , please , thank you .

A: formal
****
Q: Person1: I'm worried sick that she will leave me tomorrow .
Person2:It's no use arguing the toss .
Person1: Maybe I'll have to face the music .

A: informal
****
Q: Person1: What is the correct time , please ?
Person2:It ' s exactly twelve minutes past seven .
Person1: When will you lecture begin ?
Person2:Begin at 9 o ' clock sharp .

A:
formal
****