You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I would like to change my reservation due to sudden postponement of my meeting, can you please help me out with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name please?

USER: Sure, I have reserved it on the name of Rachel Lopez.

ASSISTANT: Please wait for a mean while.

USER: Sure, take your time.

ASSISTANT: Sorry Rachel, there is no reservation found as per your name to change it.

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

ASSISTANT: You are welcome.