You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you at this moment?

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

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

USER: Sure, I am Benjamin Wright.

ASSISTANT: Ok, please wait for few minutes.

USER: Take your time.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for reaching us.