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: Let me see . How much should I pay for you ?
Person2:Don ' t think about it !
Person1: No , this will not do . Let me see .
Person2:You pay for the taxi and dinner , then to even things up .
Person1: Good ideas .
Example Output: informal

Example Input: Person1: OK , so this is our newest machine . It was only installed last year .
Person2:What's the running speed of the machine ?
Person1: About 1,500 metres per minute . It's one of the fastest in the world . We had a few problems with it after start-up but it's running very well now .
Person2:And what's the maximum output ?
Person1: If we're running at full capacity , it's 160,000 tonnes per annum .
Example Output: formal

Example Input: Person1: Excuse me . When is breakfast time ?
Person2:From 6:00 to 9:00 .
Person1: Well , I would like to order breakfast for tomorrow coming .
Person2:Certainly , Sir . What would you like to have ?
Person1: Please give me two fried eggs , two orders of toast and a cup of coffee .
Person2:Fine.Have a nice stay here .
Example Output:
formal