You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you at this moment?

USER: I would like to change my recent reservation due to postponed of my joining date, will you help me with that?

ASSISTANT: Sure, may I know your name please?

USER: Myself Carol Harris.

ASSISTANT: Please wait, let me check if I can change your reservation.

USER: Ok, I will wait.

ASSISTANT: Sorry, we didn't find any reservation on your name to change.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.