You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I amend you for the day?

USER: My meeting got postponed as of now, so I need you to changing my existing reservation.

ASSISTANT: Ok. Sure, we are gleeful to help you.

USER: Thank you.

ASSISTANT: To proceed further I need your name, can you please provide your name?

USER: Myself Catherine Lopez.

ASSISTANT: Thank you. Please wait for a while, I will check the reservation list and revert to you.

USER: Sure, take your own time to check.

ASSISTANT: Thank you for waiting. We hardly tried to find your reservation but, no reservation has been found with your name.

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

ASSISTANT: Thank you for reaching us. Have a good day.