You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Due to heavy rain, I want to change my reservation. Can you help me?

ASSISTANT: Sure, may I know your good name please?

USER: Susan Turner here.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: No problem, Thank you.

ASSISTANT: Thank you for opting us.