A big-name guest is coming into town, and you were responsible for reserving a hotel room.

Unfortunately you were really busy and forgot to book the room.  Now all the rooms in the preferred hotel are booked, and your colleague who is chaperoning/hosting the guest is horribly embarrassed.  In a more private moment, your colleague and your boss gang up on you and start yelling at you for your complete incompetence that negatively reflects on your organization.  What do you say?