You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, please give me a minute.

USER: Ok.

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

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

ASSISTANT: Thank you, have a good day.