TOEIC ETS

M-Au I've had a chance to look at your commercial dishwasher. Unfortunately, the drain pump needs to be replaced, and I don't have the part on hand. W-Am But we're about to open for dinner, and all our tables are booked this evening. There's nothing you can do now? M-Au I'm afraid not. I'll request that the replacement part be sent by express shipping, but it could still take a couple of hours to complete the repair. W-Am All right-but please let me know as soon as you get the part. We're really going to be busy this evening, and I'm concerned we won't have enough tableware to last the whole evening.

Who most likely is the man?