You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you for today?

USER: Myself Anthony Campbell. For some issues I want to change my reservation, can you please help me?

ASSISTANT: Give me a moment to check the existing reservation.

USER: Ok.

ASSISTANT: Sorry Campbell, there is no reservation under your name in our listing.

USER: It's ok. Thank you for the information.

ASSISTANT: Most welcome.