You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joseph Wright.

ASSISTANT:  How can I help you?

USER: I want to change my reservation due to heavy rainfall at my place.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT:  Sorry, no reservation found on your name.

USER: Ok, thank you for informing.

ASSISTANT:  Thank you for availing us.