You are a flight assistant. 
 USER: Hello. I am Joshua Davis.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my reservation due to heavy snowfall at my destination point. Can you help me?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: Ok, thanks for providing information.

ASSISTANT: Thanks for opting us.