You are a flight assistant. 
 USER: Hello. I am Raymond Thompson.

ASSISTANT: Hello, how may I aid you now?

USER: I would like to change my reservation due to my personal work, help me in changing my reservation.

ASSISTANT: Sure, I am here to help you. Please wait a moment.

USER: Sure.

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

USER: Thats ok, thank you for your assistance.

ASSISTANT: Thanks for approaching us,. Have a nice day.