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: If I remember correctly , time of delivery is another point on wich we differ .
Person2:That's right . Let's go into the details .
Person1: Ok . I hope you can have these goods delivered before the end of Sep . We'd like them to be there in time for our Christmas sales .
Person2:Christmas doesn't come until almost the end of the year , right ?
Person1: But in the United States the Christmas season begins about a month before Dec . 25 .
Person2:Well . I am afraid it will be difficult for us to advance the time of shipment . Our manufacturers are fully committed at the moment .
Person1: I hope you'll try to get them to step up production .
Person2:As new orders keep pouring in , the workers are working three shifts to step up production .
Person1: If that's the case , there is nothing more to be said .
Person2:I am sorry .
Person1: What's your last word as to the date then ?
Person2:I said by the middle of Oct . This is the best we can promise .
Person1: All right . I'll take you at your word .
Person2:Good . Let's call it a deal . We will do our best to advance the shipment , but your L / C should be opened early Sep .
Person1: I promise .

Output: informal

Input: Consider Input: Person1: Jack , what's wrong ?
Person2:You !
Person1: What are you talking about ? What did I do ?
Person2:You told Martha that I was on a date ? What was that all about ?
Person1: No ... that's not what I meant . I didn't mean that . She asked me where you were and I jokingly said that you were on a date with Sara . I thought Martha knew that you and Sara were just friends .
Person2:She started feeling suspicious after you said that .
Person1: I'm sorry man . I didn't know . I didn't mean to screw anything up .
Person2:Martha gets jealous easily and it took a while to convince her that Sara was just a friend . Now , I have to explain to Sara that I can't hang around her because of you .
Person1: Look . I really didn't mean to , and next time I see Martha , I'll really tell her that you and Sara are really just friends .
Person2:Don't bother .

Output: informal

Input: Consider Input: Person1: Do you like singing ?
Person2:Yes , I do .
Person1: Let's go to a ETV tonight .
Person2:But I can't sing it well .
Person1: It doesn't matter . No one will laugh at you .
Person2:OK , I'Il go with you . When shall we go ?
Person1: What about six ?
Person2:It's too early . Let's make it seven , OK ?
Person1: OK . Let's make it .
Output: informal