You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: I would like to change my reservation because of some important work in my office, can you please help me?

ASSISTANT: Sure, I will help you with it.

USER: Thank you.

ASSISTANT: Can I know your name please?

USER: My name is Robert Allen.

ASSISTANT: Sorry Robert Allen, there is no reservation found on your name.

USER: Not an issue, anyway thank you for checking.

ASSISTANT: Thank you for choosing our agency.