H-1B stamping - visa appointment

Hello everyone,

I have my biometric on 28th March and visa appointment on 31st March in Mumbai.

I received an email yesterday from ustraveldocs asking me to reschedule my visa appointment. They gave me an option to still attend my biometric or reschedule both biometric and visa appointment. I am still going for the biometric. How can I reschulde my visa appointment without changing the biometric date? I don’t see any option to do that. What happens if I just take the biometric as scheduled and not able to reschule my visa appointment before 31 March (my original appointment date)? I don’t see any dates for visa appointment. Please advise.

Thank you, much appreciated!