You will be given a definition of a task first, then some input of the task.
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: Hi , I am afraid that the fax machine in my room won ' t be working till tomorrow . A technician has just come and checked it . He will bring me a new one tomorrow . It seems there is a big problem with mine and it will take some days for repairing . Can I use the one in your office ?
Person2:Of course you can . I am sure this one works very well . I just sent dozens of pages . How many pages are you sending ? Are you familiar with my fax machine ?
Person1: Yes , I think you have the same model as I have . Does your fax machine print out immediately a transmission protocol ?
Person2:Yes , it will print immediately .
Output:
formal