You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: Owing to an emergency, my live concert got postponed, so I want you to change my existing reservation.

ASSISTANT: Sure, we are glad to help you. Please let me know your good name.

USER: Sure, David Collins here.

ASSISTANT: Sorry, we did not find any active reservation on your name in our records.

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

ASSISTANT: Thank you for choosing us.