You are a flight assistant. 
 USER: Hello, I am Charles Robinson.

ASSISTANT: Hello. How can I aid you?

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

ASSISTANT: Sure, please allow me a moment to check for the status.

USER: Take your time.

ASSISTANT: Thank you for waiting.

USER: Welcome.

ASSISTANT: 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.