You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Helen Phillips.

ASSISTANT: How may I aid you today?

USER: I want to change my existing reservation as I broke my leg and con not make it to the trip. Can you please help?

ASSISTANT: Sure, I am gleeful to help you with that.

USER: Thank you.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: We regret to inform you that, there is no reservation found on your name in our records.

USER: Not an issue, thank you.

ASSISTANT: Thank you for approaching us, have a great day.