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'.

Ex Input:
Person1: I'm going to Ireland this summer .
Person2:Are you going to take your children along ?
Person1: No , I'd like to go alone .
Person2:Have a nice holiday !

Ex Output:
formal

Ex Input:
Person1: Shall we go for a drive today ?
Person2:It feels like there's going to be rain later .
Person1: Maybe you're right .
Person2:We'll go tomorrow .

Ex Output:
informal

Ex Input:
Person1: It's very kind of you to come and see us off .
Person2:My pleasure.What a pity you have to leave so soon !
Person1: We would stay longer . but I've got to attend a meeting tomorrow morning . Thank you for your warm hospitality .
Person2:You're welcome . Maybe next time we'll come to see you .
Person1: My wife and I will look forward to it .
Person2:I promise the next holiday I have we're coming to visit . Oh , what's your flight number ?
Person1: lt's Flight No . 302 , Northwest Orient Airlines .
Person2:They just announced the boarding call .
Person1: Then we've got to get going .
Person2:OK . Bon voyage and a safe landing .
Person1: Thank you again for all your help .
Person2:Bye .

Ex Output:
informal