You are a flight assistant. 
 USER: Hello. I am Nancy Green.

ASSISTANT: Hello, how may I oblige you today?

USER: Would it be possible to change my reservation to new travel dates?

ASSISTANT: Sure, I am gleeful to assist you.

USER: Thanks for your quick response.

ASSISTANT: Please wait for a minute.

USER: Sure, take your own time to get my reservation status.

ASSISTANT: Thank you for waiting, no reservation was found on your name to change.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for choosing us.