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'.

Example Input: Person1: How do you like your work ?
Person2:The work is rather hard , but it's interesting .
Person1: What do you do ?
Person2:I work in a publishing house . How about you ?
Person1: Mine isn't hard , but it's not interesting .
Person2:What do you do then ?
Person1: I'm a clerk in a shop .
Example Output: formal

Example Input: Person1: Do you know how to go to the Fragrant Hills in Beijing ? I heard that they are very famous in China .
Person2:Yes . Especially in autumn , the red leaves of the maple trees make the whole mountain red .
Person1: That must be very beautiful .
Person2:Yes , it can make people feel as if they were in the land of fairies .
Person1: Really ? Have you ever been there ?
Person2:A couple of times .
Person1: Can you go there with me ? I'd like someone who is familiar with that area to go with me .
Person2:Sure . I'd be very glad to be your tour guide .
Example Output: informal

Example Input: Person1: May I help you ?
Person2:Hi , this is Sharon in Mr . Reynolds ' s office . One of your delivery men picked up a package here about an hour ago .
Person1: Yes , is there a problem ? Ma ' am ?
Person2:Well , it still hasn ' t reached its destination . I wonder if you could track it down for us . Mr . Reynolds is a bit concerned .
Example Output:
formal