Yes, it is reasonable to ask, especially when the alternative is missing the interview or creating a larger scheduling problem. The firm may or may not support a format change, but asking professionally is not the same as demanding one.

Give recruiting the relevant constraint without turning the email into a long explanation. State that you can keep the original date if the interview can be virtual, and ask whether that option is available.

Do not assume the interviewer can make the change directly. Recruiting usually controls the schedule, meeting links and room logistics.

Ask as early as possible and be flexible if virtual is not an option. If the firm needs to move the date instead, respond quickly so the process can be rebooked cleanly. For more detail, see the case interview guide.

Switching format seems way less disruptive than canceling the whole date.