You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Benjamin White. Owing to an emergency, I would like to postpone my meeting. Can you please change my reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok, take your time.

ASSISTANT: Thanks for waiting and sorry to inform you, there is no active reservation found with your name in our records.

USER: It's ok, no issues. Thank you for the information.

ASSISTANT: My pleasure.