You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, I am willing to help you for this. May I know your name please?

USER: Sure, Gregory Moore here.

ASSISTANT: Just a moment, let me check your reservation status in our records.

USER: Sure.

ASSISTANT: Sorry for inconvenience, no reservation is found under your name to change.

USER: Ok, no issues.

ASSISTANT: Thank you very much for approaching our agency.

USER: Thank you for your assistance.

ASSISTANT: You are welcome.