You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: As my plans to visit Boston got postponed, can you please help me in changing my existing reservation to Boston?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.\.

ASSISTANT: May I know on whose name the ticket has been reserved formerly?

USER: My previous reservation has done with the name Christopher Turner.

ASSISTANT: Sorry Christopher Turner, there are no flights reserved on your given name formerly.

USER: Oh! That seems something went wrong while booking the ticket previously. Thank you for providing information.

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