Try this
- Separate the incoming message into practical questions and optional discussion. Answer any simple confirmed fact now, then label the remaining decision explicitly as not yet made.
- Choose a return time only if realistic. Put a reminder in your own system if you promise an update, rather than expecting the sender to chase it.
A worked example
“The address is correct. I have not decided about staying overnight; I’ll check my schedule and answer that part tomorrow evening.”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
A holding reply is a commitment to return only where you stated one. If the sender has an earlier booking deadline, say that you cannot confirm in time instead of leaving a misleading maybe.