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'.
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Question: Person1: Charles , have you finished your homework ?
Person2:Not yet , Grandma , What's the matter ?
Person1: I want you to have a walk with me .
Person2:I'll finish soon .

Answer: formal

Question: Person1: Is there a vacant table for two now ?
Person2:Yes , sir , let me show you the table . This way please .
Person1: Well , we would like to sit over there . Is that all right ?
Person2:Of course .

Answer: formal

Question: Person1: I'm looking for a white purse as a gift . Could you show what you have in stock ?
Person2:You are in luck . We just receive a shipment of several different styles of white purses .
Person1: They must be popular again this season .
Person2:Yes , I believe they are . Here are something that might interest you .
Person1: Wow . this is nice . I'll take this one . I guess if she doesn't like it she can return it , right ?
Person2:Sure . Let me ring this up for you at the register . If you would like , this can be gift-wrapped for free . Just take it to the customer service department .

Answer:
informal