You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Can you change my recent reservation to new travel dates?

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

USER: Sure, I am Brian Edwards.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time.

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

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for reaching us.