Mary: do you wanna go to see Muse?
Tom: yeah but the concerts in April no?
Mary: yeah
Mary: Why? April is bad for you?
Tom: I don't know if im not gonna be swamped with work
Mary: come on 
Mary: if that happens I'll buy the ticket off of you and go with someone else
Tom: Ok deal!
Mary: great I'll order the tickets and send them to you via e-mail
Tom: ok :)
Mary will order the tickets to a Muse concert in April. If Tom is busy at work and can't go with her, she will buy off his ticket and go with someone else. 