You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am Gary Walker, want to cancel my recent reservation due to some personal issue. Please help me out with that.

ASSISTANT: Sure, I am here to help you. Hold on for a moment. Let me check.

USER: Thank you and sure, take your time.

ASSISTANT: Sorry Gary Walker, there are no flights reserved on your given name formerly.

USER: It's ok, thank you for your help.

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