Final answer:
The sisters experienced a communication gap with the resort, due to a discrepancy between the expected information and the actual terms for booking on weekends and the minimum stay requirement.
Step-by-step explanation:
The scenario described reflects a communication gap between the sisters and the mountain resort. This type of gap occurs when there is a discrepancy between the information expected and the information received or perceived. In this case, the sisters expected the advertised price to be available for their planned family reunion weekend, but it was not available on weekends, and moreover, a three-night minimum stay was required.
This discrepancy highlights the importance of clear and accurate communication from businesses to customers to manage expectations and prevent misunderstandings. Such discrepancies can lead to customer dissatisfaction and could potentially damage the business's reputation if not properly addressed.