H1B-H4 Dropbox appointment

I have booked dropbox appointment for me (H1B) and my wife (H4) at Chennai.
I am not able to travel to India but my wife traveled.
I want to cancel mine and keep the my wife’s appointment as it is.
Is it possible to cancel just my appointment and keep dependent’s appointment as it is?
As per USVisaScheduling support team if I cancel the principal’s appointment, automatically dependent’s appointment will be canceled.
What are the alternatives for me? Anyone faced similar situation in past?