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'.
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Question: Person1: Did your eye doctor prescribe you contact lenses ?
Person2:No , I ' d like to know something about contact lenses .
Person1: Oh , I see . We have both hard and soft contact lenses . They are very popular , but a little more expensive than ordinary glasses .
Person2:I have found I ' m short-sighted recently . I need to wear glasses . As a student , it ' s better for me to wear ordinary glasses instead of contact lenses .
Person1: We have many kinds of glasses here . Which frames do you like best ?
Person2:I think the square-shaped ones will be the best for me .
Person1: What about this pair ? They are the ' in ' things now in optical wear . Try them on .
Person2:They fit me very well . I like them .
Person1: Please go to receive optometry first over there .

Answer: informal

Question: 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 .

Answer: informal

Question: Person1: Sally , I ' m tired of this Western food . I really miss my mother ' s Sichuan cooking .
Person2:I ' m sure you do miss that type of cooking . But can ' t you try to get used to Western food ?
Person1: I have tried . But Americans like butter , bread , sugar , and cream too much .
Person2:I suppose you ' re right , Lee . Maybe that ' s why so many Westerners are overweight .
Person1: It ' s interesting that Americans work very hard at their jobs , do not take naps during the day , and yet they can be so heavy .
Person2:You see , because we are often busy working , we eat too much fast food , and that food is very fattening .

Answer:
formal