You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, may I know your name please?

USER: My name is Barbara Carter.

ASSISTANT: I am sorry no reservation found on your name.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.