ิBuyer : Excuse me. Can you help me, Please?
Seller : Certainly. What can I do for you, sir?
Buyer : I'm looking for a pair of trousers.
Seller : What size would you like to have?
Buyer : Size 35.
Seller : And what colour do you prefer?
Buyer : Can I get a black one, please?
Seller : Here you are, sir.
Buyer : Thank you very much.
Seller : you're welcome.