You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Can you please assist me to make some changes in my existing reservation?

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: On my name that is Christopher Carter.

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

USER: Never mind, I may have done with my other agent. Thank you anyway.

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