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: Hi , Ellen . That outfit looks terrific !
Person2:Thanks , Jim . I didn ' t think guys paid attention to stuff like that .
Person1: No , we just don ' t usually admit it !
Person2:Well , thanks for the compliment anyway !
Example Output: informal

Example Input: Person1: Ann invited us to dinner this saturday afternoon .
Person2:What should we take ?
Person1: How about a china vase ?
Person2:Good idea !
Example Output: informal

Example Input: Person1: Is there a lot of snow in this region at this time of the year ?
Person2:Yes , the snow is often falling thick and fast here .
Person1: Well , I think I like it . I appreciate the snow very much .
Person2:Yes , It's really so beautiful with all the things covered by snow .
Person1: By the way , where can I go ski ?
Person2:There are so many places around . Take a look at the advertisement .
Example Output:
informal