Try this
- Consider who can overhear, whether either person has to remain there, and how much attention the setting allows.
- Offer a place and time both can leave comfortably. Keep the invitation separate from a demand to start immediately.
A worked example
“This feels too personal for the train. Could we choose another place?”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
A private setting should offer privacy, not make either person feel trapped.