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: Excuse me , I'm a little lost . Which bus do I take to get to Shi Da ?
Person2:Let's see . From here , you have to take the 278bus .
Person1: Oh ok , where do I get off ?
Person2:You should get off at the first Shi Da stop .
Person1: Ok , thanks ...
Person2:You're new at this , huh ?
Person1: No , is it difficult ?
Person2:No , it's quite simple . When you get on , just ask the bus driver when to pay the fare and where you want to get off .
Person1: How much does it cost ?
Person2:Only 15 NT per section . Oh look , that is your bus .
Person1: Wow , I can't thank you enough .
Person2:Don't mention it .
informal

Person1: Anyone home ? Jen !
Person2:I'm in the kitchen ... let yourself in !
Person1: Wow ! You're really working up a storm !
Person2:I know . I've even worked up a sweat .
Person1: You look like a cooking show host--only messier .
formal

Person1: so , how should we go to the theatre ?
Person2:let's take the bus .
Person1: I hate the bus system in London ! The bus drivers are rude , the buses are never on time , and there are few people around who can help you .
Person2:it's not that bad . You probably just had a bad experience once .
Person1: it wasn't just once . Every single time I take the bus , something bad happens to me or to someone else on the bus .
Person2:we could take the subway , but we'd have to go three stops along one line and then change trains twice .
Person1: train fares are twice as expensive as the bus fare , too .
Person2:if we don't hurry up , we'll miss the show . Should we take the bus ?
Person1: we're already late , so I think we had better take a taxi .
Person2:I don't think we'll be able to find a taxi very easily during hush hours . Let's just take the bus .
Person1: fine . Have a look at the timetable to find out when the next one arrives .
Person2:it looks like it should be here in just a few minutes .
Person1: don't worry . Nothing bad will happen . I'll even buy your ticket for you .
Person2:thanks , that was nice of you .
Person1: see , now something good has happened to you on a bus trip !
informal