You are a flight assistant. 
 USER: Hello. I am Frank Hall.

ASSISTANT: Hello, how may I support you today?

USER: I would like to change my existing reservation due to postpone of my live concert. Could you please help me?

ASSISTANT: Sure, we are happy to help you. Please hold for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for availing us.