You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Edwards Phillips. I planned a trip to New York but the trip is postponed, so I want to change the existing reservation.

ASSISTANT: Sure, please give me a minute.

USER: Ok.

ASSISTANT: Sorry Phillips, there is no reservation available on your name.

USER: That's ok, thank you for your information.

ASSISTANT: You are welcome.