Model booking auxiliary comments with admin updates

Q: Model booking auxiliary comments with admin updates

This is a System Design interview question from Navan for Software Engineer roles. View the full question and solution on PracHub.

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Question

Design an object-oriented model (and high-level system design) for a booking system feature that stores auxiliary comments on a reservation.

Core requirements

A reservation/booking can have an auxiliary comment (e.g., “quiet room please”, “late check-in”).
Regular users can add (or edit, if you choose) the auxiliary comment for their own reservation.
Admins can update the auxiliary comment for any reservation.

Extension

Admins may need to batch update auxiliary comments across many reservations (e.g., applying a policy note to thousands of bookings). How would you design this?

Clarifications to decide (state assumptions)

Is there one comment field per reservation, or a list/history of comments?
Do we need auditability (who changed it and when)?
Expected scale (number of reservations, frequency of updates, batch size)?

Model booking auxiliary comments with admin updates

Core requirements

Extension

Clarifications to decide (state assumptions)

Solution

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