You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you now?

USER: Can you please help me in changing my reservation as my meeting got postponed?

ASSISTANT: Ok, may I know your name?

USER: I am Emily Lopez.

ASSISTANT: Please allow me to check with your previous booking for a moment.

USER: Ok.

ASSISTANT: I am sorry to say, there is no active reservation by your name.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you.

ASSISTANT: Have a nice day.