Hi Priyanka,
Thank you for contacting the Microsoft Community.
I understand you're hoping for a daytime slot before the voucher expires. Let me explore options and guidance on how you can proceed.
For me to locate your profile, please provide the details that I have requested through private message. If you are an active ESI Learner, please contact our ESI Support Team directly, as they handle concerns when utilizing a company discounts. They can also coordinate with Pearson VUE to check other available slots or to provide other recommendations to ensure you can take your exam.
You can reach them using the contact information I also shared through a private message. Meanwhile, if the hyperlink provided above doesn't work, kindly locate the private message icon as shown below:

I look forward to your response. Please note that if no response is received after two business days, the case will be closed and locked. After the case is locked, we will no longer be able to respond, even through Private Messages. Thank you.
Warmly,