[speaker001:] Hello, ma'am. Can I help you?
[speaker002:] Yes, please. I'd like a gin and tonic.
[speaker001:] Sure, ma'am. Here you are.
[speaker002:] Thank you. How much is it?
[speaker001:] 25 yuan.
[speaker002:] Here's 30. Keep the change.
[speaker001:] Thank you very much, ma'am, but we don't take tips in China.