Can I take back a concert ticket?
Are you aware of any other tickets?
Yes, I know about the ticket she ordered before me.
If you gave a ticket to someone so that they can attend a concert, it would be rude and socially unacceptable to ask for that ticket back. That person has already made plans to attend and it would be a huge inconvenience for them to change those plans. If you need another ticket to the concert you should try finding another seller online.
I want to see that concert alone. I'm going to get this ticket back.
You shouldn't give back a concert ticket if you've been given it by someone else. Some people would consider it very rude.