You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I need to change my reservation as my meeting got postponed, can you please help me out?

ASSISTANT: Sure, I am here to help you. May I know on whose name the ticket has been reserved formerly?

USER: I am Ruth Allen.

ASSISTANT: Sorry Ruth Allen, there are no flights reserved on your given name formerly.

USER: Ok, not an issue. Thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.