Final answer:
The phrase in question is an example of a forced-choice question, which guides a respondent towards choosing between predefined options without assuming a sale or setting the terms of an agreement.
Step-by-step explanation:
The phrase "Shall I book your tour group for Friday night or Saturday morning?" is an example of a forced-choice question. This type of question is used in various contexts, including sales and research, to guide a respondent towards choosing between predefined options. The purpose here is to direct the decision-making process by limiting the options to those presented in the question. It is neither a fact-finding question, which would seek open-ended information, nor an assumption of sale, which would be presumptive of the customer's decision to purchase. Lastly, it's not closing on a stipulation as it does not involve setting the terms of an agreement.