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'.

[Q]: Person1: Hi , Jason !
Person2:Hi , Linda . I have two concert complimentary tickets . Will you go with me tonight ?
Person1: With the greatest pleasure ! Where is the concert held this evening ?
Person2:It will be held at the Central Music Hall .
Person1: What is on the program ?
Person2:It ' s a piano solo . I'm fond of piano , you know .
Person1: Hah ! OK . Let ' s go together !
Person2:Let ' s meet at the park at 6:00 .
Person1: See you then .
[A]: informal

[Q]: Person1: Sam , we are hard up for the everyday expenses . When can you find a job .
Person2:I'm looking for it , but you see , the market is hard up for jobs , too .
Person1: You liar , I saw you again in the inn . I bet you don't want to work at all .
[A]: formal

[Q]: Person1: Didn't you say you were planning a trip to China ? I heard the northwest and north of China are experiencing severe sandstorms !
Person2:I was planning to go to Beijing first and then go to northwest China ! Looks like I'm in trouble .
Person1: Definitely . I heard Beijing was experiencing seven degree strong winds ! That is nearly a record high !
Person2:No way ! I don't think I've ever encountered winds that strong ! Are the storms affecting land and air transportation ?
Person1: Absolutely ! I don't think any planes are going anywhere . The sand being blown around has cut visibility in Beijing to less than 100 meters . But inseems Gansu Province is being hit the hardest .
Person2:That's exactly where I was planning to go !
Person1: Well , this storm originated in the plateaus in northwest China . At the moment , that area is calmer .
[A]:
formal