Try this
- Ask what time and format the room permits. Use headphones if appropriate, but check whether speaking aloud is itself intrusive.
- Keep personal topics for a setting where the caller is comfortable and can end the call freely.
A worked example
“I’m sharing a room tonight. I can text briefly, but I’ll save the personal conversation for when I have a private place.”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
Do not press for a whispered conversation that the person already declined. Privacy constraints can limit the format without limiting the wish to connect.