You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to postpone my trip due to an emergency. Can you aid me in amending my existing reservation?

ASSISTANT: Sure, may I know your name please?

USER: Myself Helen Allen.

ASSISTANT: Ok, please wait for a while.

USER: Take your time.

ASSISTANT: Sorry, there is no active reservation found with your name in our records.

USER: No issues. Thank you for checking.

ASSISTANT: My pleasure.