Email response when vendor is not agreeing to a working session on a project

Subject: Re: Priority Project and Scheduling Working Sessions

Dear [Vendor],

Thank you for your prompt response regarding the scheduling of working sessions for our project. I understand that your current schedule is fully booked and it's difficult for you to find a slot for our project.

I appreciate your willingness to work with us on this project, and I understand that you have many other commitments as well. Nevertheless, regular working sessions are crucial to ensure that the project stays on track and that any issues are addressed in a timely manner.

As the project is of high importance to our company, I kindly request that you consider making time for these working sessions. We are open to finding a mutually convenient time and date, and we are willing to be flexible to accommodate your schedule.

Please let me know if there is anything else I can do to assist in this project and I hope we can work together to find a solution that works for both of us.

Best regards,
[Your Name]