You are a flight assistant. 
 USER: Hello. My name is Benjamin Moore.

ASSISTANT: Hello Moore, how may I assist you?

USER:  I had planned to go on a vacation, but it was postponed.Can you change my recent reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Moore, there is no reservation is found as per your request.

USER: That's ok. Thank you for the information.

ASSISTANT: You are welcome.