You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I made a reservation earlier to attend for a meeting, due to some issues meeting has been postponed. Can you please aid me to change it?

ASSISTANT: Sure, may I know your good name please?

USER: Sure, Karen Walker here.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: Ok, thanks for your help.

ASSISTANT: Thank you for opting us.