Finding Cover for a Shift

<-NARRATOR:-> Listen to a conversation between two students.
<-MALE STUDENT:-> Tina. I'm so glad I bumped into you.
<-FEMALE STUDENT:-> [unsuspecting] Hey, Bob. What's up?
<-MALE STUDENT:-> Well, you know how I told you I could work for you tonight-
cover your shift at the dining hall later?
<-FEMALE STUDENT:-> Yeah, thanks so much for that!
Friday night dinner shifts are tough to find substitutes for.
<-MALE STUDENT:-> Well, actually....
<-FEMALE STUDENT:-> Oh, no. Don't tell me something came up, and you're canceling.
<-MALE STUDENT:-> Um...yeah.
I'm afraid I forgot tonight...I've got a music rehearsal for the band I'm in.
<-FEMALE STUDENT:-> Music rehearsal?
<-MALE STUDENT:-> Yeah, I play keyboards for a little rock band here on campus and we've got practice tonight to prepare for a concert we're doing that's coming up...
it's really kind of important.
<-FEMALE STUDENT:-> Well, I don't know what to do now, because I already made plans to go to the school play with some friends tonight.
<-MALE STUDENT:-> Oh.
<-FEMALE STUDENT:-> Yeah. And there's no way I can find someone else to work my shift now-it's so last-minute.
<-MALE STUDENT:-> I'm really sorry, Tina.
<-FEMALE STUDENT:-> Well, I guess I could cancel my plans to see the play...
go see it another time by myself since my friends are seeing it tonight-
I think it's playing for another week.
<-MALE STUDENT:-> Or, you know, I guess I could talk to the band leader, explain to him that I can't make the band practice tonight.
<-FEMALE STUDENT:-> Yeah?
<-MALE STUDENT:-> Yeah, I mean, it's my fault I forgot.
And I want to do the right thing here since I did say I'd work for you.
It's just that some of the songs are new to me, and tonight's our last practice before the concert...
I don't want to sound bad at the show.