You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Donald Harris.

ASSISTANT: How may I assist you?

USER: Can you please help me in cancelling my reservation which I been confirmed at last week.

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Donald, there is no reservation found basis on your details.

USER: It's ok. Thank you for the information.

ASSISTANT: Thank you for contacting us.