You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: I just want to change an existing reservation as my meeting got post pone due to some technical issues. Can you help me?

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: Ashley Walker .

ASSISTANT: Sorry Ashley Walker, there are no flights reserved on your given name formerly.

USER: Not a big issue, anyhow thank you very much for checking the reservation status.

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