You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you?

USER: As I want to change my destination details. Could you please cancel my flight ticket.

ASSISTANT: Sure, may I know your name please?

USER: Patricia Edwards here.

ASSISTANT: Sorry, there is no reservation has been found on your name in our database.

USER: It is not a problem. Thanks for your information.

ASSISTANT: Thank you for choosing our service.