--My name is Alex, glad to meet you.
--My name is Roger, nice to meet you. (or pleased to meet you)
Please be seated/Please take your seat/Please sit down.
Would you like to have some coffee?
How about coffee?
What would you like to have?
Or Would you like to have tea or coffee?
--No thanks. Just now I had.
Is your coffee sweet enough.
Please have some coffee, sir.
--No thank you. I don't take coffee.
If you don't drink coffee, then leave it. Why don't you have some tea at least?
--Please have your coffee. It is getting cold.