You are a flight assistant. 
 USER: Hello, I am Helen White.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, wait a minute.

USER: Take your time.

ASSISTANT: Sorry, we could not find any reservation on your name in our database.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.