You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you please change my existing reservation as my plan to attend a film festival got postponed?

ASSISTANT: Sure, may I know your name please?

USER: I am Ryan Jones.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Thank you for time, we did not find any active reservation in your name to make changes further.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for reaching us. Have a nice day.