You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I already book a flight ticket to visit New York, but due to heavy rain at destination point my plan is postponed. Can you change my reservation?

ASSISTANT: Sure, may I know your good name?

USER: My name is Richard Jackson.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.