You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Rebecca Harris.

ASSISTANT: How may I help you?

USER: I want to cancel my reservation due to my health issue. Please, help me about it.

ASSISTANT: Sure. Please wait for a while. Your reservation by name Rebecca Harris is cancelled.

USER: Ok, fine. Thank you for cancelling my reservation.

ASSISTANT: Thanks.