You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: As my interview got preponed, so I need to change my reservation. Can you please change my reservation?

ASSISTANT: Sure, please provide me your name?

USER: Justin Walker is my name.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: There is no reservation with your name.

USER: Not a problem, thanks for your service.

ASSISTANT: Thank you for reaching us.