You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I have made a reservation earlier to attend for a conference with my clients, due to some issues conference has been postponed. Can you please make some modifications?

ASSISTANT: Sure, I am gleeful to help you.

USER: Thank you.

ASSISTANT: On what name, you have done the reservation?

USER: On the name of Anthony Walker.

ASSISTANT: Ok, please allow me a few minutes to check the reservation list.

USER: Sure.

ASSISTANT: Thank you for waiting, no reservation was found on your name to change.

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

ASSISTANT: Thank you for availing us.