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: May I know your good name?

USER: Sure, I am Robert Taylor.

ASSISTANT: Please wait.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation found on your given name.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for choosing us.