You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: David Allen here.

ASSISTANT: Allen, how can I aid you today?

USER: Due to my ill health, I am unable to travel long distances. Please help me in cancelling my recent reservation.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Hold on for a moment. Let me check.

USER: Sure, take your time.

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

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.