You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know on whose name the ticket has been reserved formerly?

USER: I am Christine Lee.

ASSISTANT: Sorry Christine Lee, there are no flights reserved on your given name formerly.

USER: No problem, thank you for the information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.