You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I made a reservation earlier this week to attend business meet. Unfortunately meeting got postponed to next month. So I would like to change my existing reservation. Can I have a help from you?

ASSISTANT: Sure, could you please provide your name to proceed further?

USER: OK, I am Katherine Moore.

ASSISTANT: Thanks for providing details, let me check and revert to you.

USER: OK.

ASSISTANT: Sorry, no reservation found with provided name.

USER: OK, thanks for your kind information.

ASSISTANT: Most welcome, thanks for contacting us.