You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

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

ASSISTANT: Sure, please provide me the name to check for the status.

USER: Myself Margaret Lopez.

ASSISTANT: Please be on hold.

USER: Take your time.

ASSISTANT: Thank you for waiting. Here, there is no active reservation have been found under your name in our database to amend it.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.