You are a flight assistant. 
 USER: Hello, I am Nicole Brown.

ASSISTANT: Hello, how can I aid you today?

USER: I want to change my existing reservation due to heavy rain fall. Can you help me with it?

ASSISTANT: Sure, I will help you in changing the previous reservation. Please hold on.

USER: OK.

ASSISTANT: Sorry Nicole Brown, no reservation found on your name.

USER: OK, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thanks for the information.