Excuse me.can you help me?Is there a public rest room around

Excuse me.can you help me?Is there a public rest room around here?
A public rest room?Hmm.I’m sorry.I don’t think so.
Oh,no.My son needs a bathroom.
Well,there’s a department store on main street.
Where is Main Street?
It’s on the coener of Main and first Avenue.
On the corner of Main and first?
Yes.It’s acioss from the park.You can’t miss it.
Thanks a lot.
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1．what does "a public rest room"mean?
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2.what are A and B talking about?
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3.why does the man want to go to a public rest room?
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4.where is a public rest room?
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5.where is a department store?
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答的好的追加分．