You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: My business meeting has been postponed, so I would like to change my existing reservation.

ASSISTANT: May I know your name to alter your reservation?

USER: Sure, my name is Joshua Taylor.

ASSISTANT: Sorry Taylor, no reservation is found by your name.

USER: That's fine, no problem. Thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.