You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Donna Martinez want to cancel my reservation due to prepone of my interview,. Can you help me in cancelling ticket?

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry for inconvenience, there is no reservation found with your given name.

USER: Thank you for your quick response.

ASSISTANT: Thank you for opting us.