You are a flight assistant. 
 USER: Hi, I am Margaret Williams.

ASSISTANT: Hello, how can I assist you?

USER: Due to postponed of my Business meeting, so I would like to change my existing reservation. Can you assist me with this?

ASSISTANT: Ok, wait for some time I will check and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting there is no reservations found on your name. Thanks for choosing us, Have a great day.

USER: Ok, not a problem. Thank you.