You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I have a reservation to attend a get together party. It has been postponed. Can you please change my existing reservation?

ASSISTANT: Sure, may I have your name please?

USER: Joshua Jackson is my name.

ASSISTANT: Please wait for couple of minutes.

USER: Sure.

ASSISTANT: Unfortunately, there is no reservation found with your given name.

USER: Ok, no issue.

ASSISTANT: Thank you for reaching us help.

USER: Thanks for your kind information.