Write an email requesting approval of a purchase order for $500 from my supervisor, Randal.
Subject: Request for Approval of Purchase Order

Dear Randal,

I am writing to request your approval for a purchase order in the amount of $500. The purpose of this purchase is [state the purpose, e.g., to buy office supplies, software licenses, etc.].

After conducting thorough research, I have identified the vendor who can provide the required items at a competitive price without compromising quality. The vendor is [vendor name] and I have attached the quotation and other relevant details for your review.

I believe that this purchase is necessary for the smooth functioning of our department and will help us to enhance our productivity. The funds for this purchase are available in our department's budget and will not have any adverse impact on our overall financials.

I would appreciate it if you could review the attached documents and approve this purchase at your earliest convenience. If you have any questions or concerns, please do not hesitate to contact me.

Thank you for your consideration.

Sincerely,

[Your Name]

Here is a possible email you could write. Do note that the content and tone of the email should be adjusted according to the context of your situation. Finally, please remember to replace the square brackets with the relevant details before you send the email. Feel free to ask me if you have any other queries.
Thanks. Can you help me write another email? I need to email my friend Joe and explain that I won't be able to attend our scheduled meeting on Monday because my dog ate the report. Don't actually say that in the email, but make up an excuse.
Dear Joe,

I hope this email finds you well. Unfortunately, I have some bad news. I won't be able to attend our scheduled meeting on Monday as something urgent has come up which requires my immediate attention.

I sincerely apologize for the inconvenience this may cause you and hope that we can reschedule soon. Let me know if there is anything I can do to help in the meantime.

Best regards,

[Your Name]