Thanks, but no thanks.

Thank you. 
Can you tell me how much it will be? 
Regarding the method of payment, can I my ［a］ credit card? 

Thank you. Then I'll return to my work. 

Thanks, but no thanks.
ありがとうございます。でもご遠慮致します。

Thank you. I was planning to come home earlier, but I... 

Thank you very much for a wonderful evening.

It's very thoughtful of you to receive

Thank you for your understanding.

Thank you for your hard work and perseverance.