You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: I have planned to change my reservation due to bad weather condition, can you assist me?

ASSISTANT: May, I know your good name?

USER: Dennis Nelson.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for reaching us.