You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Unexpectedly my plan got changed, so I decided to cancel my recent reservation, will you help me in cancelling my ticket?

ASSISTANT: Sure, I will help you.Can you please provide me your name to check previous reservation?

USER: My previous reservation is booked with name Helen Carter.

ASSISTANT: There is no previous reservation on your name to cancel.

USER: It's ok, thank you for the information.

ASSISTANT: Most welcome. Hope you have a great day ahead.