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, can you provide me your name?

USER: My name is Brenda Baker.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Brenda Baker. I regret to inform that there is no reservation by your name.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for contacting us.