You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know your name please?

USER: I am Ruth Green.

ASSISTANT: How can I aid you?

USER: I want to change my existing reservation to Los Angeles because my conference has been postponed.

ASSISTANT: Sure, Please wait for a while I while check and revert you.

USER: Ok.

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

USER: Not an issue. Thank you for your kind information.

ASSISTANT: Thank you for choosing us , have a good day.