You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me in changing my recent reservation?

ASSISTANT: Sure, may I know your good name please?

USER: Sure, I am Nicole Roberts.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: Ok, that's fine. Thank you for your immediate response in searching.

ASSISTANT: Thank you for contacting us.