You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Lisa Allen here.

ASSISTANT: How may I aid you?

USER: I have to cancel my reservation which I have done earlier to participate in dance program but unfortunately I have stay back here to take care of my injured friend. Can you please help me out with cancelling of my reservation?

ASSISTANT: Sure, I will help you with the flight reservation cancellation.

USER: Thank you.

ASSISTANT: I have searched online but I could not find your flight reservation to cancel it. Thank you.

USER: Oh! I think think ticket was not booked properly while I am booking. Thank you for the information.