You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I assist you?

USER: I need to change my existing reservation because it was so rainy. Can you please change my reservation?

ASSISTANT: Sure, Can I know your name please?

USER: Anna Robinson is my name.

ASSISTANT: There is no reservation found with your name.

USER: No problem, thanks for your service.

ASSISTANT: Thank you for choosing us, Have a great day.