You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nancy Lewis.

ASSISTANT: How can I assist you?

USER: I had planned to attend a business meeting, but it was postponed. Can you help me in changing my recent reservation?

ASSISTANT: Sure, please give me a minute.

USER: Ok.

ASSISTANT: Sorry Lewis, there is no reservation available on your name.

USER: That's ok. Thank you for your help.

ASSISTANT: You are welcome.