You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation as my exam got postponed.

ASSISTANT: May I know your good name?

USER: I am Emma Smith.

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

USER: No issues, thank you for the information.

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