You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Assist me in cancelling my flight ticket. As I modified my travel dates.

ASSISTANT: Sure, please share your good name?

USER: Thanks for accepting my request. I am Donald Robinson.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your given name.

USER: Not an issue. Thanks for your response.

ASSISTANT: Thank you for choosing us.