Extend Booking Request Expiration?

Hi, I am a sitter, and I received a request for drop-in visits. The client was planning in advance, so we have plenty of time between the request and when the booking date would be. We planned a meet-and-greet, however, it occurs after the 72-hour booking request expiration timeframe. I'm under the impression that if I let a request expire, it will hurt my booking score. However, it's not expiring for lack of communication or fault on my part - we have a meeting scheduled. How do I extend the time before the booking request expires, as I do not want to confirm the booking without first meeting the client?