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'.

Input: Consider Input: Person1: Hi , I have a doctor ' s appointment scheduled with Dr . Smith , and I need to change it .
Person2:What day did you have it scheduled for ?
Person1: My appointment was on Tuesday .
Person2:What time was it scheduled for ?
Person1: It was for two o ' clock in the afternoon .
Person2:I see your appointment . What day would you like to switch to ?
Person1: I would like to switch it to next Friday .
Person2:What time would you like ?
Person1: I would like to come in at 10
Person2:Fine , I will pencil that in right now . We will see you then .

Output: formal

Input: Consider Input: 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 .

Output: formal

Input: Consider Input: Person1: Wow ! Look at the time . lt's about 11 0 ' clock .
Person2:Really ? I didn't realize it was so late .
Person1: I've got to catch the last bus . See you later .
Output: informal