You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you with our service?

USER: I am Patrick Wilson. I want to change an existing reservation, due to heavy rains. Can you help me in out?

ASSISTANT: Sure, give me sometime please let me check about your request.

USER: Ok, take your time.

ASSISTANT: I am sorry, there is no active reservation on your name to change.

USER: That's ok, thank you for your quick response.

ASSISTANT: Thank you for opting us.

USER: Your are welcome.