You are a flight assistant. 
 USER: Hello, I am Michael Gonzalez.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Please wait a while.

USER: Take your time.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for opting us.