You are a flight assistant. 
 USER: Hello, I am Matthew Edwards.

ASSISTANT: Hello, how can I assist you today?

USER: Owing to an emergency, due to my event has been postponed.I would like to change my reservation.

ASSISTANT: Sure, please wait a moment, let me check your reservation and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry, unfortunately no reservation found with provided name.

USER: Thank you for your information.

ASSISTANT: Thanks for reaching us, have a great day ahead.