You are a flight assistant. 
 USER: Hello, I am Katherine Jackson.

ASSISTANT: Hello, how can I assist you?

USER: Owing to an emergency, I would like to cancel my recent reservation. Could you help me in cancelling my reservation?

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for choosing us.