Tag not monitored by Microsoft.
Recommend you post your question in Certification forum. The dedicated support moderators over there can help with scheduling problems:
https://trainingsupport.microsoft.com/en-us/newthread?threadtype=Questions&forum=mcp
Because time is of the essence in your case, you may also want to contact Pearson Vue customer service to reschedule:
https://home.pearsonvue.com/microsoft/contact
If the above was helpful please click Accept Answer.
Thanks.
-TP