You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best assist you today?

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

ASSISTANT: Sure, may I know your name please?

USER: I am Janet Brown.

ASSISTANT: Ok, please give me a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there was no reservation found on your name.

USER: No problem, Thank you.

ASSISTANT: Thank you for choosing us.