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'.

[EX Q]: Person1: My computer isn ' t running at the same speed it used to be , it is testing my patience everyday . Can you tell me how to make it run faster ?
Person2:If you want to speed up your system , you ' Ve got to clean it up first .
Person1: How ?
Person2:You need to free your disk space . The simplest way is to use a Disk-Cleanup tool to remove temporary files and in store programs that you no longer use . Things should be fine next time you start . You also need to control what starts up . There is a program calls Start-up Delayer , It can help to set after how much time programs should be loaded after Windows boosts . For example , you can choose to set your Fox Mail program to load 30 seconds after Windows starts up .
Person1: Very useful advice , I will try them right now .
[EX A]: formal

[EX Q]: Person1: Excuse me , sir .
Person2:What's the matter ?
Person1: I heard that we will call at some ports on the way . Is that true ?
Person2:Yes .
Person1: Where will we call at ?
Person2:Dalian .
Person1: Dalian is my hometown .
Person2:Really ?
Person1: Can I get off the ship and walk around ?
Person2:Sorry . I'm afraid you couldn't .
[EX A]: informal

[EX Q]: Person1: Dad , what are we doing tonight for fun ?
Person2:We're going over to Mrs . Smith's place to help her with her yard work .
Person1: Yard work ? I said ' what are we doing for fun ' , not work !
Person2:It will be fun . And besides , you'll be in the best company .
Person1: Dad . You're so cute . What do I need to do to help get ready ?
Person2:You could get the rakes and some shovels together and I'll put them in the car .
Person1: Jeans and a tee shirt , right ?
Person2:Yes and maybe a jacket in case it gets cool .
[EX A]:
informal