Definition: 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:  Person1:       Who's in charge of the construction project ?  
 Person2:We've taken on a civil engineer on a nine-month temporary contract . He'll oversee the whole project . In fact we're having a project meeting at 3 p . m this afternoon allocate responsibilities and finalise the time schedule . Why don't you join us ?  
 Person1:        I can ’ t I'm afraid . I've got another meeting scheduled for 2:30 p . m . 

formal