You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, let me know your good name please.

USER: I am Lisa Scott.

ASSISTANT: How can I help you today?

USER: I just want to change an existing reservation due to bad weather conditions.

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Thanks for your time. Unfortunately we found no reservation by your name.

USER: Ok. thank you.

ASSISTANT: Thank you for approaching us and have a nice day.