You need to go to Sylhet to attend your cousin's engagement on a fixed date. You will travel by coach and want to book two tickets in advance, specifying the boarding point and seat preferences. Prepare communications and details needed to secure the booking.

a. Write an email to the Manager of the bus company requesting booking for two seats (include date, preferred bus type, boarding point, seat preference, and contact details).

b. List all the essential pieces of information you must provide to ensure the booking is processed without delay or confusion.

c. Write a polite sentence requesting confirmation of the booking and stating how you will pay.

d. Draft a short follow-up message to send if you do not receive confirmation within 48 hours.