You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Raymond Wilson. I want to change an existing reservation, due to heavy rainfall. Could you help me in changing my reservation?

ASSISTANT: Sure, I would be happy to help you. Please wait for a moment, I will check the reservation list and revert you.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Not an issue. Thanks for your quick response.

ASSISTANT: Thanks for contacting us and have a nice day.