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: I got a promotion . Lunch is on me .
Person2:It ' s great .

Output: informal

Input: Consider Input: Person1: Well , tell me something of yourself .
Person2:What would you like to know , Mr . Green ?
Person1: What working experience have you got ?
Person2:In 2004 , I got a job in the sales department of a trading company near Guangzhou . I started a sales representative . A year later , I was promoted to the position of sales manager . I had that job ever since , which is just over a year now .
Person1: Oh , good . Irene , can you tell me why you plan to quit being a sales manager to work here as my assistant ? Don't you like your present job ?
Person2:Frankly , some part of it I enjoy very much , but I prefer something more professional . It happens that I have a friend working here in this company . She told me the export department was to recruit an assistant . I felt very excited at this news . That's why I'm here .

Output: formal

Input: Consider Input: Person1: What can I do for you ?
Person2:Can I have a look at your handworks ?
Person1: All right . This way , please .
Person2:You have quite a range , haven't you ?
Person1: Yes , sir .
Person2:They are all produced in China , aren't they ?
Person1: Yes , they are all distinctive Chinese .
Person2:Could you please select me one ?
Person1: How do you like this one ? It's very beautiful .
Person2:Oh , I like it very much . How much does it cost ?
Person1: 350 yuan .
Person2:OK . I'll take it .
Output: informal