You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you today?

USER:  I am Brenda King want to cancel my reservation due to prepone of my meeting. Can you help me in cancelling?

ASSISTANT: Please wait a moment, let me check and revert to you.

USER: Ok.

ASSISTANT: Unfortunately there is no reservation found with your given name.

USER: Ok, no issues.

ASSISTANT: Thank you for opting us.

USER: Thank you for your response.