Got it.
So, you haven't received the request to send passport? And interview date is predefined by them? You can't change it?
Maybe the information below will help you.
Regarding the date of the interview, this is what is written in the document:
“If you cannot attend this interview and/or have pre-booked travels outside of Canada in
the 90-days following your final determination for permanent residence interview, please
e-mail
WST-Landing-Enquiries@cic.gc.ca or call the IRCC Call Centre at 1-888-242-2100.”
With respect the passport and other documents:
"Please bring the following original documents to your interview:
A valid passport, identity or travel document; if you were previously advised that you
are exempt from the travel document requirement, bring other documents establishing
your identity.
Important: If for any reason you are not in possession of valid identity/travel
documents at the time of the appointment, you must advise this office PRIOR to
the appointment date.
Two photographs of yourself and for each person in your family that is being processed
for permanent residence inside Canada.
Please show the photographer the document found here:
http://www.cic.gc.ca/english/information/applications/guides/pdf/5445EB-e.pdf
Current and expired Temporary Resident documents issued by IRCC
These include work permits, study permits & visitor records.
Proof of Payment of the Right of Permanent Residence Fee
Please ensure you either have a copy of the receipt printed or saved PDF copy viewable
on an electronic device.
Please note:
If you have recently changed any of the following without updating IRCC, please scan &
e-mail
WST-Landing-Enquiries@cic.gc.ca your update and document(s) immediately.
Please also bring the original documents along to your interview."