You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you on this day?

USER: Raymond Green here. Due to bad weather condition I would like change my reservation. Can you help me?

ASSISTANT: Sure, I can help you in changing, please wait for a while. Sorry Green, there is booking found on your requested information.

USER: It's fine.

ASSISTANT: Thank you for your information and reaching us.

USER: Thank you for your help.

ASSISTANT: Welcome.