You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best may I serve you today?

USER: I want to change my reservation as my exam got postponed to other dates, so please help me.

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: May I know your name please to check the status of your reservation?

USER: Sure, I am Jeffrey Campbell from Orlando.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, no existing reservation was found on the name of Jeffrey Campbell.

USER: No worries, thank you.

ASSISTANT: Thank you for choosing us.