Final answer:
The best time to ask if a guest would like a second beverage is true as they may still be thirsty after finishing their last sip.
Step-by-step explanation:
The best time to ask if a guest would like a second beverage is True. This is because as soon as they finish their last sip, they may still be thirsty and open to accepting another beverage. By asking at this moment, you can provide prompt service and enhance the guest's experience.