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: Hello . Overseas operator . May I help you ?
Person2:Yes . I'd like to make a collect call to Japan .
Person1: Your name , please ?
Person2:It's Helen Kent .
Person1: Who would you like to talk to ?
Person2:I'd like to talk to Mr . Edna Kent .
Person1: Is that Mr . Edna Kent ?
Person2:That's right .
Person1: What number are you calling from , please ?
Person2:From code 513 , 432-6748 .
Person1: And the number in Japan , please ?
Person2:Country code is 81 , area code 138 , and the number is 846-8972 .
Person1: Hold the line , please . I'll put your call through .
Output:
formal