You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Due to urgent work, I would like to change my reservation to some other date, can you please help me out with that?

ASSISTANT: Can I know your name?

USER: Thank you for accepting my request, I had reserved it on the name of Donna Taylor.

ASSISTANT: Sorry, no reservation found by your name.

USER: Oh! I think the ticket was not booked due to server issues. Anyway, thank you for the information.

ASSISTANT: Thank you.