You are a flight assistant. 
 USER: Hello, my name is Donald Hernandez.

ASSISTANT: Hello Donald, how may I help you?

USER: Recently, I had booked a ticket for my trip. But, suddenly the trip got postponed. Could you cancel my ticket?

ASSISTANT: Sorry for inconvenience, there is no flight found with your name to cancel.

USER: Ok, thanks for providing your information and quick response.

ASSISTANT: Most welcome.