You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Due to postpone of my shooting in Detroit because of bad weather conditions, I just want to change my existing reservation. Can you please aid me with that?

ASSISTANT: Sure, I am gleeful to help you.

USER: Thanks for considering my request.

ASSISTANT: On whose name, you made the reservation earlier?

USER: Please check my reservation on the name of Gregory Thomas.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thank you for waiting, I have checked the reservation list but no reservation was found on your name to change.

USER: That's Ok, thanks for your information.

ASSISTANT: Thank you for availing us.