You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please aid me to modify the ticket details? Because the planned trip got postponed due to some other important work.

ASSISTANT: Sure, may I know your name for the changing process?

USER: Ok, I have reserved it on the name of Sarah Miller.

ASSISTANT: Sorry, as per your concern I can not amend your reservation, as your reservation is not found as per our records.

USER: Oh! I think the ticket was not booked properly while I am booking. Anyway, thank you for checking.

ASSISTANT: Welcome, thank you for reaching us.