You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My business meeting is postponed so , I would like to change my existing reservation. Can you help me?

ASSISTANT: Sure, can you please provide your name?

USER: Sure, the ticket has been reserved with name Patricia Nelson.

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

USER: Ok, not an issue. Thank you.

ASSISTANT: Thanks for approaching us.